Thank You for Watching the fuel pump relay wiring video! Subscribe To This UA-cam Channel: ua-cam.com/users/4g63mightymax See My Wiring Playlist: ua-cam.com/play/PLsF7T1tRFy2hmiiUUfMZNyV-BUA_yrPIh.html
Do you have a multipump tutorial of this? Can the relays be linked in parallel using 87a to one toggle switch for example having a surge tank with 4 fuel pumps and 4 5 pin relays? Then keeping the factory in tank pump connected to the factory wiring?
I followed your instructions and installed the new rellay it worked fine however I have a 86 f150 Ford it has a additional fuel pump inside the fuel tank do I have to wire the inside fuel pump I wired the front inline pump indepented from the original harness directly to battery and use a towel switch to activate the relay I need know if I need to wire a switch to operate the inside tank fuelpump in order to supply the front inline pump does it require it own relay system
Thanks George! I did one similar a few months ago and people really liked it. So I bought a few more relays, switches and fuses so that I can do some more automotive wiring how-to’s! :) Thanks for watching!
There are very few creators on YT that know what they are talking about and, secondly, can communicate their knowledge to others. You are one of only a tiny handful that gets my unqualified approval. Thanks!
I'm not a mechanic I'm not a electrician but this video helped fix my problem on the signal wire. The electrician told me the pump is gone an I have a racing pump saved alot off money THANK You VERY MUCH,🙏
That is the best possible comment I could hope for on one of my videos! Thank you so much for sharing it with me. I really am happy that the video gave you what you needed and saved you some cash !
I was 25 hours from home and this setup got me home. Moab to Detroit. Used a light bar wiring kit from Walmart. It had every component you listed. Can’t thank you enough.
That’s absolutely badass! I’m so incredibly thankful and excited you wrote this. It’s really motivating to know that my videos are actually helping out people! Thanks for watching!
@@WiringRescue I was stranded in a parking lot. it took me half a day to diagnose the short somewhere in my pump relay circuit. Crank no start. No voltage at the pump. Couldn’t find the short so I bypassed everything and used a rocker switch. You literally saved me thousands of dollars. The world is a better place with awesome people like you. Thanks again
You are my mentor and you don’t even know it I will figure out a way to send you pics of my setup with everything I’ve learned from your channel when it’s done
@@WiringRescue I'll be undertaking this soon as I have no power on my fuel pump .. relay ok fuel pump ok ground ok but no power . The next step just hardwiring it and be done with it lol
I've used this 3 times now, thank you! Obd0 to obd1 honda conversion always messes with the fuel pump where it won't trigger it at all. This is a better fix than repinning the jumper harness
Thank you! If you like this one, you’ll probably like a few other more elaborate wiring videos I have! Sort my videos by views and check out the top ones if your bored :)
You may add, that a relay needs to be diode protected in order for the circuit to be computer controlled. So that when the relay coil is turned off it does not back feed voltage into computer.
Thank you so much for posting this video! Any recommendations how to use trigger wire based on boost level or only turn it on when car is above certain rpm range ?
When it comes to upgrading fuel systems in turbochargerd cars, people usually upgrade the fuel pressure regulator to one that is a 1:1 rising rate. That way you can run a high volume fuel pump all the time and it runs like stock. However, when the turbo spools and starts making boost,the fuel pressure increases 1psi for every 1psi of boost. For higher horsepower applications (maybe 600hp+), you’ll get into larger fuel line, multiple pumps and surge tanks/swirl pots. Below that, 1 good high volume pump should do the job just fine.
These videos are great. I found your channel at the perfect time. I’ve been rewiring a motorcycle harness and feel very overwhelmed, this honestly helped as this is on my list to do. Definitely glad to have came across this and now subscribed! Thank you
Thank you so much! I am having trouble to get 12 volts to the live wire. I will try your schematic to see if it works. Great video and well explained. God bless you Mr.
Thanks so much this helped me a lot. Been chasing wiring,fuses,relays, etc and still Didn’t have power to pump then decided try to re run it all Myself and found this video, thanks man
😂 Thank you! This was one of my earliest wiring videos and it seems to be a hit. However, this one is my personal favorite ua-cam.com/video/Yz9kqxWkoHI/v-deo.html
@WiringRescue question: could I use any 4 pin fuel pump relay from any car to create this setup. Plus does the relay need a earth wire for the relay to work. I just put an AEM 340LPH in a mitsubishi GTO in uk.
@@beastman.330- Mitsubishi GTO’s are awesome, and I happen to be a big Mitsu enthusiast actually . So - your 4 pin relay just needs to be rated for the amperage that your fuel pump draws. Most aftermarket relays are rated 25 or 30 amps, and I think a 340 will draw less than 20 if I recall correctly. You DO need to ground pin 85 on your relay to a good ground/earth. Then the pump will need a ground/earth wire as well. Your factory fuel pump wire will go to pin 86 and it will turn your relay on. Pin 87 will go to your pump. Pin 30 will be a fused power source from your battery. Again, this fuse should be rated just higher than your fuel pump amperage draw. And this wire needs to also be rated for a higher amperage than your fuel pump draws. I usually use 8 gauge wire when I rewire fuel pumps.
If your ignition switch is already fused somewhere before it, then you won’t need a fuse on your trigger wire (pin 86). However, if that pin 86 were to accidentally short out, it will pop the fuse for the ignition which will shut down everything on the ignition circuit. So it’s up to you! :)
Yeah I used these 5 pin relays to add factory power windows to my vehicle. Bought a FSM wiring book then created my own wiring loom. Used heavier grade wires and they work faster than if factory installed.
Hey just watched your video here. Really good stuff. I love how you've laid it out on this piece of cardboard and just made it really simple and straightforward. I love that. I feel like if you can lay stuff out in front of you and trace it out. It's just so much easier to visualize it and think about it in your head
Glad I found this. I am already a subscriber. I wired a relay off my ignition wire to aft as a “jumper” to keep my ign switch from overloading. But I think it’s causing issues. The pump does not come on now. Also my grounds should go to each other and on pin 85. Will try this. Pump worked before but I had aftermarket efi. Now I switched back to carb and the fuel pump does not work. Will rewire and retry! Before the ecm would “ground” the pump and switch it on.
Most ECUs control the pump (in fact all actuators and other stuff) with switched negative. Positive is always present at the pump, as switched positive can backfeed the ECU.
Terrific explanation and diagram. I'm trying to drain the fuel tank on my 204 Buck Ranier, and have tried using a jumper, but I can't keep the pump running. I will have to study your setup and try again. Thank you.
Does this mean I can wire up 3 fuel pumps to my car turn one on to run the car normal and when am ready to let her eat just turn on the 2nd and 3rd pump and bring up my fuel pressure to the required amount to bring out the 850-900 pony’s in her? I get that I would have to wire up each pump separate
Dude the best video I'm a carpenter not an electrician and I've been looking for a week for a video that would simplify these things This video is straight into the point thank you 👍👍👍 Ps I will be sure to like and share and anything else to promote that I can
Subscribed. That was what I needed thank you. I have a 2007 Acura TL. No power to the fuel pump. Fuse is good. Relay is good. Wiring is correct. I’m not sure what wrong with it. Maybe fuse box? I’ve run out of time and money so this may just have to do the trick.
I enjoyed the video. Unfortunately, half of them say that pin 30 is the one with constant power. The other half suggest that the constantly hot pin is 87. I wouldn't care that much except that the diagram is on the relay rather than the fuse box. Unfortunately, a 4-pin relay can be installed two different ways if you catch my drift. I'm only looking to transfer some old gas out of the tank. Need to determine the exact location of pins 30 & 87. Thanks.
every kill switch / fuel pump interrupt video on youtube is about a toggle switch. not one describes how to build a latching relay with a momentary push button. a momentary push button has an automatic reset with a latching relay setup, which is way more secure since you can't forget to reset the kill switch circuit. myself, personally, I would definitely forget making this kind of circuit useless for security. i know you're not necessarily talking about kill switches, but it would be nice if people could explain how to wire up a latching relay circuit with a momentary push button, because a toggle switch is less than ideal, and exactly where to tap into these power sources on the car itself. you'd do a great job of it. thanks!
thank you for this guide.....1972 vw beetle.....can the fused trigger be connected to the positive side of the coil or generator. i will still wire in a shut off switch on the trigger line.
Great Practical Video! Made diagnosing my marine water pump a LOT easier (: And even MORE Amazing, you could do it without giving us "background" or the "history of" the fuel pump or the relay. Eventually, someone is going to figure out how to make a practical youtube. They should hire you to head it up.
Super helpful video! Maybe an ignorant question, but how do I determine the value of the fuses between the battery and pin 30 and between the trigger wire and pin 86?
Quick question, I'm trying to add a kill switch to my truck for the fuel pump... When I cut the positive wire to it from the fuse box do I run 2 wires from pin 87 to connect to each wire... Also since it's going to be on a rocker switch can I just add a jumper wire from pin 30 to 86 and it still work, or do I have to run pin 86 back to the battery...
If you don't have a factory computer trigger wire make sure you run the trigger wire through an oil pressure switch, the last thing you want in an accident is the fuel pump running feeding a possible fire.
Agreed! Another option would be an inertia switch like I showed in this video. ua-cam.com/video/MHgMHE6TUG8/v-deo.html. Thanks for watching and sharing a good tip!
Great video and easy to follow. I have my LS3 all hooked up accordingly, the pump comes on key ignition, and it starts up. however when I run the car down the road easily and then jump on it, the fuel pump shorts out, but not the fuse and stops the car. I would take a live 12V battery spare wire and hook it to the fuel pump wire and start the car and it starts so I could get back home, then I have to disconnect the "hot" wire off the fuel pump wire otherwise the engine would stay on after removing the key. What connection do I have wrong that would make the fuel pump cut out just by quickly jumping or accelerating the engine?
I Love the physical schematic and great explanation. I do have a question: on another video I saw that the presenter mentioned about wire “87A” as your direct hot wire to the fuel pump in case of emergency, is this true? . Now, my pump will run but it will not prime when I turn the key on, the vehicle requires, at least, two good long cranks to then start. After that, I can hear my fuel pump humming normally. I also replaced the relay only to observe the same behavior. Is this a sign my pump,is going bad? All of this happened after my mechanic replaced the electronic spark control among other things. Please shed some light? Thanks again!
Thanks for watching! I haven't seen that other video, so I can't be exactly sure how their circuit worked. There are many ways to wire a fuel pump though, so anything is possible. If the fuel pump isn't priming when you are trying to start it, I would expect it to be very difficult to start. If I were you, I would connect a fuel pressure gauge to the fuel system and see if it is getting fuel pressure when cranking the engine. If not, hunt down the reason why. It sounds like you may already know this reason. My guess is that your fuel pump is getting fed power in the "Run" position, but not the "Start" position. Good luck!
Great video. I’m assuming I can use the same gauge wire if I’m switching over from a mechanical pump, amperage fuse according to manufacturer or is there a standard, thanks
How do you know what fuse to use? different fuses going to the same relay. For us laymen, how do we figure this out. Also, what do you suggest tying into for a Jeep YJ without an electric fuel pump? Key ignition?
I made a video for that! Here you go ua-cam.com/video/EhzN6UdnmPA/v-deo.html. As for the YJ, grabbing an ignition source for the fuel pump relay would probably work okay, just make sure you have a fuel pressure regulator, because if your engine is off and your key is on, the fuel pump will run and flood the engine bigtime without one.
Can this by pass the fuel pump relay in the fuse box? I shorted my fuel pump relay and pin 85(ground) melted a couple wire in some places through out the engine harness. My car cranks but won’t start. Was wondering if this could fix my issue, with the use of a hardwired/external fuel pump relay kit. Thanks in advance
Hello! The electricity works the same way on a diesel, so the relay circuitry should be the same! Good luck on your project and thanks for watching the video!
Thanks thats a great explanation and i thought I'd found my problem.... VW 2.5tdi, Turn key, no glowplug symbol, turns over but no start If i link pins 30 and 87 on the 109 relay glowplug lights and starts normally Tried other spare relays without link and same issue Tested relays on bench and they all work Therefore i think my problem is before the relay so i need to dig deeper I've started looking for worn wires under bonnet but not found anything yet Thanks
Sounds like you are on the right track! A wiring diagram for your car would probably help you tremendously. Sometimes cars have safety’s in place to prevent a relay from turning on if it senses something strange. Any chance you have a check engine light on as well, or other oddities that could be related?
@@WiringRescue Hello again, I worked on the van again this morning and found the problem. It was one of the first things i checked but i didn't see the idea through. This time i tested for continuity along the black and white wire from relay 109 pin 85 to the ECU til i found a break in an area i can't get to. I linked a temporary cable at the ECU back to the fuse board at pin 85 and the van started normally with glowplug symbol. I also fixed issues with the brake light switch and brake wear sensor so I'm chuffed. Only last fault is after engine starts the glowplug symbol starts flashing after 30 seconds? I've read it could be a bad glowplug or electrical connection or maybe a simple scan reset or battery reconnection would cure it. I'm well happy 👍
That is fantastic! Congrats on the diagnosis, that's gotta feel good. Hopefully the blinking glow plug light is an easy fix. I don't generally work on diesels, so I would be of no help on that one! :)
Man, I'm glad I found your channel... so dammm easy to follow along and we'll explained.. great layout.. Thank you, great video.. I just subscribed as well.. Quick question.. I'm doing LS swap, heavy duty wire 10g? 30 amp fuse?
I’m glad you like the channel! As for the wiring question - “it depends”. Luckily, I made I video for this exact wire/fuse question. Here you go! ua-cam.com/video/EhzN6UdnmPA/v-deo.htmlsi=PBNIa51bUPTmtPh6
Awesome diagram for us visual/practical learners, thanks. What is the purpose of 87A? Is it for an alternate circuit sharing the ground (85) with 87? Does it trigger synchronously with 87 from 86 (on trigger, 87 and 87A both become high), or does it alternate state with 87 (ie, 87 high, 87A low, then 87 low, 87A high)?
So, let me see if I understand this correctly? My situation I am converting from efi on my 1981 jeep cJ7. I am retaining my in-tank fuel module (fuel pump). the power from my fuel pump will connect to PIN 87 and 30 will be connected to battery power and My trigger PIN 86 if I wire in a switch can come from the same 12v power source as PIN 30? Or, I could wire in the switch off of PIN 86 to my ignition power source and I would have to switch the switch to on to get fuel or if I left it off, I could use accessories power and not have the pump running if I did not want to start the engine? Do I understand that correctly... Sorry if this is a stoopid question. Thanks for your video it has helped a lot.
Thank you so much for the information. The wiring harness on my 1999 Mercedes has failed and I need to run new wires, relay, and fuses to get the fuel pump running. I do not have the means of dropping the fuel tank to do this so I have to run the wires from the inside of the car through the fire wall on the engine bay. I had to remove the back bench seat inside the car and pull up the carpet to get to the fuel pump. I replaced the fuel pump and a week later it stopped working. I then had to have the car towed home. Two days later I disassembled the car again, unplugged the fuel pump, and plugged it back in and it worked. This car has been quite a nightmare.
@@dwight_boi - you absolutely can. Or you can use the factory fuel pump feed wire to power pin 86 on the new relay. That way the new relay is controlled with all the factory key-on controls. That is assuming your factory setup works, which is seems like it may not. So - yeah, I’d probably just ignore all the factory stuff and do this setup instead.
Thanks for the kind words! I would think this is very possible! Maybe I'll see if I can get my hands on an inertia switch and make some videos with it. Looks like they are $10-20 on Amazon. Hmm. This could be fun!
Are these wire setup safe on modern car's design? Because it have safety design built into ECU just in case there's an accident so that it can shut off vehicle fuel pump from not getting rpm input information from crankshaft sensor?
The wire size depends on the fuel pump you have. I actually made a video on that too! Check this one out, I think it will help make sense of it all. ua-cam.com/video/EhzN6UdnmPA/v-deo.html
Hi! Nice video 😍 im am rebuilding a fusebox in My car and re-wiring. But the relays are old and has a shape that only fits oem fusebox. How do i know which relay to buy to that match the old ones ?
Generally you would figure out what the relay does, and then either look it up online or go to an auto part store. You may need a wiring diagram to tell you which relay is which if the fuse box doesn’t tell you. For example - you’d search for “electric fan relay” or “fuel pump relay”, if you need a replacement.
I would say that is not super normal in my experience. If I were you, I would make sure the relay is properly rated for the amperage that you are drawing through it. For example, if your fuel pump is drawing 20 amps and you have a relay rated at 20 amps, you are right at its limit. It may be good to step up to a larger amperage relay. Relays are way cheaper than melted wires and fire! Good luck!
Absolutely brilliant thank you so much, just what I needed explaining! Can I ask dumb question though? Why can't 12v battery be connected straight to pump + & - terminals to test the pump please? Thanks
If you are just testing a pump to see if it works, you can do that, but you should also make sure you have properly sized wire and a fuse in between the battery and pump.
@@WiringRescue Thank you so much for quick response. Don't quite understand the need for a fuse to be honest. Is it to stop the pump from receiving too much amperage? What size fuse would you recommend? Thanks so much for your time.
Fuses protect the circuit from fire. You need to know how many amps the fuel pump will draw to determine the fuse size. Check this one out ua-cam.com/video/EhzN6UdnmPA/v-deo.html
@@WiringRescue Thanks for your help. So they protect the circuit rather than the pump. So in theory I could use heavy duty jump leads straight from battery to fuel pump which won't damage the pump (it may be dead anyway!) and won't burn the wires? Apologies for my lack of knowledge! Thank you
![How To Test and Diagnose Relays and Wiring [4 & 5 Pin]](http://i.ytimg.com/vi/S-DwV0HLsE4/mqdefault.jpg)
![How To Test and Diagnose Relays and Wiring [4 & 5 Pin]](/img/tr.png)
Thank You for Watching the fuel pump relay wiring video!
Subscribe To This UA-cam Channel: ua-cam.com/users/4g63mightymax
See My Wiring Playlist: ua-cam.com/play/PLsF7T1tRFy2hmiiUUfMZNyV-BUA_yrPIh.html
Hi i want to asking something its possible the electric fuel pump with RPM tachometer connected
For what year vw vehicle is this video?
Thank you
very good video. very interesting and informative
Do you have a multipump tutorial of this? Can the relays be linked in parallel using 87a to one toggle switch for example having a surge tank with 4 fuel pumps and 4 5 pin relays? Then keeping the factory in tank pump connected to the factory wiring?
I followed your instructions and installed the new rellay it worked fine however I have a 86 f150 Ford it has a additional fuel pump inside the fuel tank do I have to wire the inside fuel pump I wired the front inline pump indepented from the original harness directly to battery and use a towel switch to activate the relay I need know if I need to wire a switch to operate the inside tank fuelpump in order to supply the front inline pump does it require it own relay system
Why does everyone else seem to take three times as long to describe half as much detail with a quarter of the clarity? Nice one... 👍
Thank you!! I’m glad it was able to help you out!
@@WiringRescue I just watched 5 videos trying to find this one...they should delete theirs. Thank you!
Facts wish this vid was out when I ran one
Visuals
I agree.
Funny how it’s easier to understand when placed out on a grid/chart compared to laying under a car trying to trace it ........ nice job
Thanks George! I did one similar a few months ago and people really liked it. So I bought a few more relays, switches and fuses so that I can do some more automotive wiring how-to’s! :) Thanks for watching!
Watched so many videos and was still left scratching my head on what to do, until I watched yours so easy to follow and straight to the point 👌👍
That’s awesome! Thank you for watching my video!
What happens if I bypass fuel pump relay 85 - 86 on GM truck thanks buddy i so much worry do I made mistake on ECM to burn?
There are very few creators on YT that know what they are talking about and, secondly, can communicate their knowledge to others. You are one of only a tiny handful that gets my unqualified approval. Thanks!
That’s extremely kind! Thank you so much for watching the wiring videos! I really appreciate it!
I'm not a mechanic I'm not a electrician but this video helped fix my problem on the signal wire. The electrician told me the pump is gone an I have a racing pump saved alot off money
THANK You VERY MUCH,🙏
That is the best possible comment I could hope for on one of my videos! Thank you so much for sharing it with me. I really am happy that the video gave you what you needed and saved you some cash !
U should see my face when the car started 😎 thanks again I appreciate your video,🙏🇿🇦
I was 25 hours from home and this setup got me home. Moab to Detroit. Used a light bar wiring kit from Walmart. It had every component you listed. Can’t thank you enough.
That’s absolutely badass! I’m so incredibly thankful and excited you wrote this. It’s really motivating to know that my videos are actually helping out people! Thanks for watching!
@@WiringRescue I was stranded in a parking lot. it took me half a day to diagnose the short somewhere in my pump relay circuit. Crank no start. No voltage at the pump. Couldn’t find the short so I bypassed everything and used a rocker switch. You literally saved me thousands of dollars. The world is a better place with awesome people like you. Thanks again
This is the best video on this subject. Simple, accurate, thorough and complete. The wire for the trigger showed where my problem was. Thank you !
That’s awesome! Thanks for watching, I’m glad that you found the video helpful!
You are my mentor and you don’t even know it I will figure out a way to send you pics of my setup with everything I’ve learned from your channel when it’s done
😂awesome! Post it on instagram and tag me in it @ratty_muscle_car
Im not great with stuff like this - That being said probably the best explanation out there
Thanks for watching! I have tons more wiring videos, if you find yourself bored this weekend. Good luck with your project!
@@WiringRescue I'll be undertaking this soon as I have no power on my fuel pump .. relay ok fuel pump ok ground ok but no power .
The next step just hardwiring it and be done with it lol
Thanks for making it so easy, I've put off installing an elec fuel pump for so long, now I can attack it with confidence.
That’s fantastic! I’m glad the video gave you what you needed!
I've used this 3 times now, thank you! Obd0 to obd1 honda conversion always messes with the fuel pump where it won't trigger it at all. This is a better fix than repinning the jumper harness
Heck yes! That’s awesome! I’m glad you are finding it useful! Thanks so much for watching!
Definitely the best explanation I've seen so far. Fuel pump relay went bad in my 04 Expedition and this is exactly what I needed.
Thank you! I'm glad it was able to help you out!
I'm here for the same reason on my 03 expedition. Lol what size fuse would be best for trigger and power? Same as factory fuse or something higher?
Videos like this make me love wiring and electrical. When I don't know, I absolutely hate it that you so much,. great video!
I love this, straight to the point, very easily explained. So simple you need somebody to help you misunderstand it!😳
Thank you! If you like this one, you’ll probably like a few other more elaborate wiring videos I have! Sort my videos by views and check out the top ones if your bored :)
This was clear, not ‘wordy’, concise, and to the point…..unlike most others. Thx 👍
Thanks bro from Philippines. This is the presentation I've been looking for. God bless your channel
Thank you! I’m glad the video has helped you out!
You may add, that a relay needs to be diode protected in order for the circuit to be computer controlled. So that when the relay coil is turned off it does not back feed voltage into computer.
Nicely done with the parts mounted on the board for a good visual learning experience.
Thank you so much for posting this video! Any recommendations how to use trigger wire based on boost level or only turn it on when car is above certain rpm range ?
When it comes to upgrading fuel systems in turbochargerd cars, people usually upgrade the fuel pressure regulator to one that is a 1:1 rising rate. That way you can run a high volume fuel pump all the time and it runs like stock. However, when the turbo spools and starts making boost,the fuel pressure increases 1psi for every 1psi of boost.
For higher horsepower applications (maybe 600hp+), you’ll get into larger fuel line, multiple pumps and surge tanks/swirl pots. Below that, 1 good high volume pump should do the job just fine.
These videos are great. I found your channel at the perfect time. I’ve been rewiring a motorcycle harness and feel very overwhelmed, this honestly helped as this is on my list to do. Definitely glad to have came across this and now subscribed! Thank you
OMG! This is 110% perfect! Thank you so much for the short and simple explanation! Great video!
You’re very welcome! I’m glad it helped you out!
Thank you so much! I am having trouble to get 12 volts to the live wire. I will try your schematic to see if it works.
Great video and well explained. God bless you Mr.
Glad you liked the video! Thanks for watching!
Thanks so much this helped me a lot. Been chasing wiring,fuses,relays, etc and still
Didn’t have power to pump then decided try to re run it all
Myself and found this video, thanks man
I give this video a 10/10.
😂 Thank you! This was one of my earliest wiring videos and it seems to be a hit. However, this one is my personal favorite ua-cam.com/video/Yz9kqxWkoHI/v-deo.html
@WiringRescue question: could I use any 4 pin fuel pump relay from any car to create this setup. Plus does the relay need a earth wire for the relay to work. I just put an AEM 340LPH in a mitsubishi GTO in uk.
@@beastman.330- Mitsubishi GTO’s are awesome, and I happen to be a big Mitsu enthusiast actually .
So - your 4 pin relay just needs to be rated for the amperage that your fuel pump draws. Most aftermarket relays are rated 25 or 30 amps, and I think a 340 will draw less than 20 if I recall correctly.
You DO need to ground pin 85 on your relay to a good ground/earth. Then the pump will need a ground/earth wire as well.
Your factory fuel pump wire will go to pin 86 and it will turn your relay on.
Pin 87 will go to your pump.
Pin 30 will be a fused power source from your battery. Again, this fuse should be rated just higher than your fuel pump amperage draw. And this wire needs to also be rated for a higher amperage than your fuel pump draws. I usually use 8 gauge wire when I rewire fuel pumps.
@WiringRescue Thank you very much, my friend.
@@beastman.330 - happy to help! Good luck with the Mitsu GTO!
literally the best video i've seen on this. thank you
You helped me finish my project with this. This channel is a big help.
That’s fantastic! I’m thrilled to hear that my videos are helpful to people! Thanks for watching the video!
simple and straight.
Hey if I wire (trigger) to my ignition barrel do I still need to fuze it.
Thanks for your videos 😊
If your ignition switch is already fused somewhere before it, then you won’t need a fuse on your trigger wire (pin 86). However, if that pin 86 were to accidentally short out, it will pop the fuse for the ignition which will shut down everything on the ignition circuit. So it’s up to you! :)
@@WiringRescue thanks so much for your prompt response 👍👍
Best video I’ve seen on the subject. You’re the man!
The best video on UA-cam thank you
That’s a serious statement! Thank you so much! I appreciate it!
Yeah I used these 5 pin relays to add factory power windows to my vehicle. Bought a FSM wiring book then created my own wiring loom. Used heavier grade wires and they work faster than if factory installed.
Yes! These things are so cheap and universal, which is awesome. On a car, they have an infinite amount of uses. Thanks for watching the video!
Very nice video that was fun to watch without getting confused or lost.
Awesome! I’m glad it was helpful to you! Thank you for watching!
Good job. The least confusing version I've seen
Thank you! I’m thrilled to hear you found it helpful! :)
Hey just watched your video here. Really good stuff. I love how you've laid it out on this piece of cardboard and just made it really simple and straightforward. I love that. I feel like if you can lay stuff out in front of you and trace it out. It's just so much easier to visualize it and think about it in your head
Thank you for making this explanation so simple
Happy to help! Thank you for watching the video!
Glad I found this. I am already a subscriber. I wired a relay off my ignition wire to aft as a “jumper” to keep my ign switch from overloading. But I think it’s causing issues. The pump does not come on now. Also my grounds should go to each other and on pin 85. Will try this. Pump worked before but I had aftermarket efi. Now I switched back to carb and the fuel pump does not work. Will rewire and retry! Before the ecm would “ground” the pump and switch it on.
Most ECUs control the pump (in fact all actuators and other stuff) with switched negative. Positive is always present at the pump, as switched positive can backfeed the ECU.
I was just watching a bunch of switching trough relay videos and none of them switched nor the relay or applications trough zero. What a shame.
Ummm.......nope. You will NEVER see always positive at a pump. If you do, you f'd up. You do, however, find constant positive at the relay
Terrific explanation and diagram. I'm trying to drain the fuel tank on my 204 Buck Ranier, and have tried using a jumper, but I can't keep the pump running. I will have to study your setup and try again. Thank you.
Best explanation to date, great content
Glad it was helpful! Thanks for watching!
Wiring videos are all outstanding.
Thank you! I have a bunch if you're bored! Check out this playlist ua-cam.com/video/c8JDQrUquw8/v-deo.html
@Roger Labbee Thank you! I really really appreciate that!
Does this mean I can wire up 3 fuel pumps to my car turn one on to run the car normal and when am ready to let her eat just turn on the 2nd and 3rd pump and bring up my fuel pressure to the required amount to bring out the 850-900 pony’s in her? I get that I would have to wire up each pump separate
Yes! - that is totally correct. You’ll also want to make sure your fuel pressure regulator can handle 3 pumps! Good luck with the project!
exactly the video I was looking for thanks🍻
Awesome! I’m glad that it helped you out!
Thanks a lot for these videos... it's simple and well explained ...big thumbs up
Thanks for watching! I’m glad that you liked it!
B E A utiful ! I love this presentation!
Thanks! I’m glad you liked it! Subscribe and I’ll make more!
Just what i was looking for. I'm building an engine test stand, this will be perfect. Thanks so much.!!
Happy to help! I’ll likely be needing your channel’s advice as I do more work to my 71 Mercedes! ua-cam.com/video/yvjzerUFvyI/v-deo.html
@@WiringRescue Absolutely. I also run a Facebook group " Mercedes Maintenance" join us. Loads of expert and helpful people there. Cheers John 🍻
Dude the best video
I'm a carpenter not an electrician and I've been looking for a week for a video that would simplify these things
This video is straight into the point
thank you 👍👍👍
Ps
I will be sure to like and share and anything else to promote that I can
Good video a lot info best video for fuel pump relays on UA-cam
Thank you! I really appreciate that!
Like how you explain everything, I'm your new subscriber now 👍
Thank you! I appreciate every subscriber I earn!
Subscribed. That was what I needed thank you. I have a 2007 Acura TL. No power to the fuel pump. Fuse is good. Relay is good. Wiring is correct. I’m not sure what wrong with it. Maybe fuse box? I’ve run out of time and money so this may just have to do the trick.
Complimenti, ottimo video, secondo te è possibile aggiornare questo cablaggio con un potenziometro di flusso per la pompa?
I enjoyed the video. Unfortunately, half of them say that pin 30 is the one with constant power. The other half suggest that the constantly hot pin is 87. I wouldn't care that much except that the diagram is on the relay rather than the fuse box. Unfortunately, a 4-pin relay can be installed two different ways if you catch my drift. I'm only looking to transfer some old gas out of the tank. Need to determine the exact location of pins 30 & 87. Thanks.
every kill switch / fuel pump interrupt video on youtube is about a toggle switch. not one describes how to build a latching relay with a momentary push button. a momentary push button has an automatic reset with a latching relay setup, which is way more secure since you can't forget to reset the kill switch circuit. myself, personally, I would definitely forget making this kind of circuit useless for security. i know you're not necessarily talking about kill switches, but it would be nice if people could explain how to wire up a latching relay circuit with a momentary push button, because a toggle switch is less than ideal, and exactly where to tap into these power sources on the car itself. you'd do a great job of it. thanks!
Great vid I was about to install a switch for my hi pressure fuel pump but using a relay makes much more sence for my 500hp 65 GTO😛
love the vids man. i definitely look forward to your videos... and not just cause im also ls swapping my 72 lemans as well!
Thank you Mike! I'll keep making them if you keep watching!
Watch all already. Wish you had more. All great.
I’ll keep making them if you keep watching them!
Great video, do you have a video that explains how to wire dual relays to a selector valve for running dual fuel tanks?
thank you for this guide.....1972 vw beetle.....can the fused trigger be connected to the positive side of the coil or generator. i will still wire in a shut off switch on the trigger line.
Great Practical Video! Made diagnosing my marine water pump a LOT easier (: And even MORE Amazing, you could do it without giving us "background" or the "history of" the fuel pump or the relay. Eventually, someone is going to figure out how to make a practical youtube. They should hire you to head it up.
Perfect explanation!
Thank you! I appreciate the kind words.
To the point, clear and concise. Best treatment I've watched.
Thank you! I appreciate the kind words!
Super helpful video! Maybe an ignorant question, but how do I determine the value of the fuses between the battery and pin 30 and between the trigger wire and pin 86?
Great question! It depends on the components that you are using. I made a whole video about this actually! :) ua-cam.com/video/EhzN6UdnmPA/v-deo.html
Quick question, I'm trying to add a kill switch to my truck for the fuel pump... When I cut the positive wire to it from the fuse box do I run 2 wires from pin 87 to connect to each wire... Also since it's going to be on a rocker switch can I just add a jumper wire from pin 30 to 86 and it still work, or do I have to run pin 86 back to the battery...
If you don't have a factory computer trigger wire make sure you run the trigger wire through an oil pressure switch, the last thing you want in an accident is the fuel pump running feeding a possible fire.
Agreed! Another option would be an inertia switch like I showed in this video. ua-cam.com/video/MHgMHE6TUG8/v-deo.html. Thanks for watching and sharing a good tip!
Great job 👍🏻
Thank you! I really appreciate it!
Great video and easy to follow. I have my LS3 all hooked up accordingly, the pump comes on key ignition, and it starts up. however when I run the car down the road easily and then jump on it, the fuel pump shorts out, but not the fuse and stops the car. I would take a live 12V battery spare wire and hook it to the fuel pump wire and start the car and it starts so I could get back home, then I have to disconnect the "hot" wire off the fuel pump wire otherwise the engine would stay on after removing the key. What connection do I have wrong that would make the fuel pump cut out just by quickly jumping or accelerating the engine?
You running dual tanks? I’m doing my first LS swap in a 77 C10 and could use some help where possible.
Heavier gauge wire, fuse, relay and good grounds. It seems like the pump is demanding more than it can get.
I Love the physical schematic and great explanation. I do have a question: on another video I saw that the presenter mentioned about wire “87A” as your direct hot wire to the fuel pump in case of emergency, is this true? . Now, my pump will run but it will not prime when I turn the key on, the vehicle requires, at least, two good long cranks to then start. After that, I can hear my fuel pump humming normally. I also replaced the relay only to observe the same behavior. Is this a sign my pump,is going bad? All of this happened after my mechanic replaced the electronic spark control among other things. Please shed some light? Thanks again!
Thanks for watching! I haven't seen that other video, so I can't be exactly sure how their circuit worked. There are many ways to wire a fuel pump though, so anything is possible. If the fuel pump isn't priming when you are trying to start it, I would expect it to be very difficult to start. If I were you, I would connect a fuel pressure gauge to the fuel system and see if it is getting fuel pressure when cranking the engine. If not, hunt down the reason why. It sounds like you may already know this reason. My guess is that your fuel pump is getting fed power in the "Run" position, but not the "Start" position.
Good luck!
This is what I needed! Thank you well put
I’m very happy that it helped you out! Thanks for watching!
This has to be the best video I have ever seen. Nice work!
Wow! Thank you!!!
If I’m running a HP fuel pump AND a LP lift pump. Do I just have th few same wiring? Just twice running along side?
hi, nice video, one question, what is the nominal value of fuse inline with fuel pump?
That all depends on your fuel pump. Check out this video where I explain how to figure out the correct size. ua-cam.com/video/EhzN6UdnmPA/v-deo.html
Great video. I’m assuming I can use the same gauge wire if I’m switching over from a mechanical pump, amperage fuse according to manufacturer or is there a standard, thanks
Good video, if I want run two pumps can I use 87a,or 87 split In two cables?
Great video. I follow for your work.👍🏻
Thank you! I appreciate you watching!
Thanks for the info!
You are very welcome!
Nice wiring video
How do you know what fuse to use? different fuses going to the same relay. For us laymen, how do we figure this out. Also, what do you suggest tying into for a Jeep YJ without an electric fuel pump? Key ignition?
I made a video for that! Here you go ua-cam.com/video/EhzN6UdnmPA/v-deo.html. As for the YJ, grabbing an ignition source for the fuel pump relay would probably work okay, just make sure you have a fuel pressure regulator, because if your engine is off and your key is on, the fuel pump will run and flood the engine bigtime without one.
Awesome video man made it super easy
Thank you! I'm glad you enjoyed the video!
Great work on this video
Can this by pass the fuel pump relay in the fuse box? I shorted my fuel pump relay and pin 85(ground) melted a couple wire in some places through out the engine harness. My car cranks but won’t start. Was wondering if this could fix my issue, with the use of a hardwired/external fuel pump relay kit. Thanks in advance
You can replace your entire fuel pump circuit with this, as long as you have an ignition wire to power up pin 86 on the relay.
Very helpful video
Thank you ! I’m glad you found it helpful!
Good Day mate, thanks for time on great video 👍😊 mate can I use it for on Diesel engine ? Cheers
Hello! The electricity works the same way on a diesel, so the relay circuitry should be the same! Good luck on your project and thanks for watching the video!
Thanks thats a great explanation and i thought I'd found my problem....
VW 2.5tdi,
Turn key, no glowplug symbol, turns over but no start
If i link pins 30 and 87 on the 109 relay glowplug lights and starts normally
Tried other spare relays without link and same issue
Tested relays on bench and they all work
Therefore i think my problem is before the relay so i need to dig deeper
I've started looking for worn wires under bonnet but not found anything yet
Thanks
Sounds like you are on the right track! A wiring diagram for your car would probably help you tremendously. Sometimes cars have safety’s in place to prevent a relay from turning on if it senses something strange. Any chance you have a check engine light on as well, or other oddities that could be related?
@@WiringRescue Hello again,
I worked on the van again this morning and found the problem.
It was one of the first things i checked but i didn't see the idea through.
This time i tested for continuity along the black and white wire from relay 109 pin 85 to the ECU til i found a break in an area i can't get to. I linked a temporary cable at the ECU back to the fuse board at pin 85 and the van started normally with glowplug symbol.
I also fixed issues with the brake light switch and brake wear sensor so I'm chuffed.
Only last fault is after engine starts the glowplug symbol starts flashing after 30 seconds?
I've read it could be a bad glowplug or electrical connection or maybe a simple scan reset or battery reconnection would cure it.
I'm well happy 👍
That is fantastic! Congrats on the diagnosis, that's gotta feel good. Hopefully the blinking glow plug light is an easy fix. I don't generally work on diesels, so I would be of no help on that one! :)
@@WiringRescue thanks mate 👍
Man, I'm glad I found your channel... so dammm easy to follow along and we'll explained.. great layout..
Thank you, great video.. I just subscribed as well..
Quick question.. I'm doing LS swap, heavy duty wire 10g?
30 amp fuse?
I’m glad you like the channel! As for the wiring question - “it depends”. Luckily, I made I video for this exact wire/fuse question. Here you go! ua-cam.com/video/EhzN6UdnmPA/v-deo.htmlsi=PBNIa51bUPTmtPh6
@@WiringRescue can't thank you enough.. great videos!!
Awesome diagram for us visual/practical learners, thanks. What is the purpose of 87A? Is it for an alternate circuit sharing the ground (85) with 87? Does it trigger synchronously with 87 from 86 (on trigger, 87 and 87A both become high), or does it alternate state with 87 (ie, 87 high, 87A low, then 87 low, 87A high)?
Thank you! I actually made a video that answers exactly this question! Take a peek when you have a chance! ua-cam.com/video/W2Mr2Zgv1Ck/v-deo.html
So, let me see if I understand this correctly? My situation I am converting from efi on my 1981 jeep cJ7. I am retaining my in-tank fuel module (fuel pump). the power from my fuel pump will connect to PIN 87 and 30 will be connected to battery power and My trigger PIN 86 if I wire in a switch can come from the same 12v power source as PIN 30? Or, I could wire in the switch off of PIN 86 to my ignition power source and I would have to switch the switch to on to get fuel or if I left it off, I could use accessories power and not have the pump running if I did not want to start the engine? Do I understand that correctly... Sorry if this is a stoopid question. Thanks for your video it has helped a lot.
Doing this can improve presure of fuel? Good for high load engine for racing?
Great advice
Thanks! I’m glad you like the video!
Great stuff can you advise what gauge wire you mean when you say heavy gauge and what size fuses would you use for this.
I actually made a video to answer that exact question. Check this out: ua-cam.com/video/EhzN6UdnmPA/v-deo.html
Thank you so much for the information. The wiring harness on my 1999 Mercedes has failed and I need to run new wires, relay, and fuses to get the fuel pump running. I do not have the means of dropping the fuel tank to do this so I have to run the wires from the inside of the car through the fire wall on the engine bay. I had to remove the back bench seat inside the car and pull up the carpet to get to the fuel pump. I replaced the fuel pump and a week later it stopped working. I then had to have the car towed home. Two days later I disassembled the car again, unplugged the fuel pump, and plugged it back in and it worked. This car has been quite a nightmare.
Hopefully you can throw something together to get it going again! When going the "correct" route fails or is too expensive, just start hotrodding it!
This might get my Z back up and running!! 😦🤞🏽
If I run this relay do I disconnect the factory relay?
@@dwight_boi - you absolutely can. Or you can use the factory fuel pump feed wire to power pin 86 on the new relay. That way the new relay is controlled with all the factory key-on controls. That is assuming your factory setup works, which is seems like it may not. So - yeah, I’d probably just ignore all the factory stuff and do this setup instead.
@@WiringRescue IT WORKED!! Got my Baby up and running!! Thank you!!
Did you put a switch?
@@aammadmustafa5985 yup! Just a simple on / off switch
man this vid is great thanks !!😀👍
Jeremy could you add a circuit similar to this with an inertia cut out? As always your “mediocre “ site is great. Roger
Thanks for the kind words! I would think this is very possible! Maybe I'll see if I can get my hands on an inertia switch and make some videos with it. Looks like they are $10-20 on Amazon. Hmm. This could be fun!
I will have one sent. Tell me where. Roger
Are these wire setup safe on modern car's design? Because it have safety design built into ECU just in case there's an accident so that it can shut off vehicle fuel pump from not getting rpm input information from crankshaft sensor?
Excellent 👍
Thank you! I appreciate it!
Thank you so much for the video!
What size gauge wire did you use?!
The wire size depends on the fuel pump you have. I actually made a video on that too! Check this one out, I think it will help make sense of it all. ua-cam.com/video/EhzN6UdnmPA/v-deo.html
New subscriber 🔥🔥🔥
Thank you!
Hi! Nice video 😍 im am rebuilding a fusebox in My car and re-wiring. But the relays are old and has a shape that only fits oem fusebox. How do i know which relay to buy to that match the old ones ?
Generally you would figure out what the relay does, and then either look it up online or go to an auto part store. You may need a wiring diagram to tell you which relay is which if the fuse box doesn’t tell you. For example - you’d search for “electric fan relay” or “fuel pump relay”, if you need a replacement.
Thanks dear sir, thankful video 😊
Thanks for the content I did what you taught me but just one question is it normal for the relay to get a little warm?
I would say that is not super normal in my experience. If I were you, I would make sure the relay is properly rated for the amperage that you are drawing through it. For example, if your fuel pump is drawing 20 amps and you have a relay rated at 20 amps, you are right at its limit. It may be good to step up to a larger amperage relay. Relays are way cheaper than melted wires and fire! Good luck!
Absolutely brilliant thank you so much, just what I needed explaining! Can I ask dumb question though? Why can't 12v battery be connected straight to pump + & - terminals to test the pump please? Thanks
If you are just testing a pump to see if it works, you can do that, but you should also make sure you have properly sized wire and a fuse in between the battery and pump.
@@WiringRescue Thank you so much for quick response. Don't quite understand the need for a fuse to be honest. Is it to stop the pump from receiving too much amperage? What size fuse would you recommend? Thanks so much for your time.
It's ok actually, have seen some other posts on this thread that explain it
Fuses protect the circuit from fire. You need to know how many amps the fuel pump will draw to determine the fuse size. Check this one out ua-cam.com/video/EhzN6UdnmPA/v-deo.html
@@WiringRescue Thanks for your help. So they protect the circuit rather than the pump. So in theory I could use heavy duty jump leads straight from battery to fuel pump which won't damage the pump (it may be dead anyway!) and won't burn the wires? Apologies for my lack of knowledge! Thank you