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Thank you very much for this video. For the life of me I couldn't understand the necessity of replacing a $20 sensor part when it ostensibly appeared solid state in nature. Seeing some of the mechanically-activated moving parts internally explained this much clearer to me. And to be smart enough to actually test the old part for failure - that was great!
excellent! Without performing an autopsy on the unit, one can't acquire the info needed to fully diagnose the circuit based on the diagram alone. This video is great!!
Great video. Using a 1/4" to 1/8" brass reducer I was able to put a sender from a 92 gmc Van into my 85 gmc van. The video helped me figure out the wiring. Works great now (I just connected the gauge wire because there is no second switch on an 85)
Outstanding video! You laid that out perfectly and answered the all the questions I had about the sorcery involved in the topic. There are so many 'how it works' pages and videos that just essentially say 'connect this to that and it works!' Maddening! Thank you for filling in all the gaps my friend
This is a great video explaining the inner workings of the switch. I like the way he shows 50 psi air pressure simulates the 50 psi oil pressure. I also like the way he explains how the potentiometer works inside the switch to get particular oil pressure reading, by having a lever slide up and down the spring as pressure changes. The electrical diagram fails to show the variable resistor on the ground side.
I watched the whole video and learned a lot even though this wasn't the video to answer the question I was currently searching for. A lot of interesting details explained very well. Nicely done my friend!
I had a oil pressure sender go bad on my 98 Buick. The diaphragm had failed causing engine oil to go all over. Put a new one on and it was fine. My car has a light, not a gauge so it probably didn't have a potentiometer. Thanks for posting.
Great video as always. I was looking for such information and solute to your explanation! Hope I would solve the problem in view of your guidance. Regards,
AWESOME VIDEO SIR!!! EXCELLENT WORK!! Unfortunately now that you've got the cogs going you have to deal with a question :D I was wondering if I could use this oil pressure switch and the wiring to add an electric oil pressure gauge to my vehicle. It's a ford. The very bottom of the gauge looks identical but the top half obviously doesn't exist on my cars stock OPS. So I'm curious if this would be a viable option to add an after market oil pressure gauge. Also anyone who knows the answer FOR SURE can answer this question for me.
Some of these same exact sensors only have a 1 pin connector. So this only applies if your sensor has 3 pins. Otherwise an excellent video that explains it perfectly.
Thank you for the video; does this apply to 2000 Chrysler Voyager? My oil light is on and the oil is fine; battery is dead now. I was told that it could only be reset during an oil change and then told to change a 9 volt battery to reset the switch. I am not savvy with cars so would I have to send my van to the mechanic?
A wise engineer links the oil pressure circuit and the fuel pump wiring, planning for those disasters that are avoidable by design. I'll have to try that some day, (ie take out the fuel pump relay while running, to see if fuel still flows). Great demonstration, Duane.
@happy543210 I appreciate your reply, as I do find what he said at 1:58 to be confusing. Did he word that incorrectly? Looking at the schematic, if power from the fuel pump relay is interrupted, there is still a way for voltage to make it's way to the fuel pump, coming from the oil sending unit, as long as the engine is left on.
I have a 98 Chevy 1500 4.3l the oil pressure gauge likes to fluctuate. I have noticed it do this while driving in town. If I'm on the highway it runs with a steady reading most of the time. Sometimes while on the highway I notice the gauge needle flicker. Could it be the oil pressure switch sending a false reading to the dash cluster or maybe a ground problem? Any advice would be greatly appreciated. Thank you and I hope i described this in good detail.
@happy543210 I love that idea. But, after I change my oil, for about 6 seconds the engine starts with no oil pressure. And, when driving, if you get a 'no oil' signal from your oil pressure light, the engine stays on until you either pull over or seize the engine, whichever comes first. It doesn't shut fuel delivery off automatically. Looking at the schematic, if the fuel relay is closed, then pos voltage gets to the fuel pump, regardless of the status of the oil sending unit signal.
@CoolasIce2 GM had a big problem with their wiper fluid heaters a while back because they were also on circuits that were "always hot". Condensation built up inside the reservoir and closed the switch unintentionally, causing the heater to come on and creating a fire in the engine compartment.
My 89 Silverado oil pressure gage and oil pressure switch are separate. One is next to my oil filter and the other next to the distributor. The oil pressure switch only has 2 terminals, so would it be safe to bypass it with jumper only until I can buy another in a few days??
Here is my 2 cents. I was trying to pull the oil pressure sensor off of my 1988 s10 but didn't have the oil pressure socket. So I snapped the thing in half to get a regular socket on it (turns out I didnt have a wide enough socket so I had to wrench it off anyways *hardy har har*) but I drove it with broken sensor for 27 miles. The truck ran fine, it stalled coming off of the highway (I was freaking out) but the truck started and ran. My SES still comes on but now I am thinking it is the EGR the IAC valve or the MAPS sensor. So I will replace all of that along with the fuel pump to see if this will help the poor idle and Stalling. It runs rough up until you hit Highway speeds so maybe there is something like a broken vacuum allowing extra fuel into the filter... So to say the least this is going to be fun. I think for the fuel pump to shut off completely you need to actually hit 0 PSI. I read somewhere that if you are at 7 PSI the pump shuts off but I know that engines with a crap load of miles on it wont have as much oil pressure anyways.
Good morning. Thank you for the video. Could this also cause the engine to stop after a few seconds of run time. That is if the pressure sensing side is malfunctioning. Would cause the fuel pump to not transfer to the run side of the circuit?
after replacing a brand new oil switch from autozone on my S10 due to leakage, the oil gauge immediately swings to extreme extreme high, passing the maximum 80, more like 120, but 80 is the highest reading. is it a bad switch, any idea please???
@Bushougoma How can this be since in most 4 cylinders the two piston that come up are on different cycles one exhausts the other is on the compression cycle?
@VMATT500C As long as the ignition key is in the on position the pump should run. If I understand this correctly, the oil sender keeps the pump running in the event the relay goes bad while the engine is running. If this is the case, I have to say, personally, I'm not a big fan of this backup system
@CoolasIce2 That's what I've been trying to say all along...as long as there's oil pressure (running engine), the fuel pump runs...lose the oil pressure (engine turned off), fuel pump stops...where did I confuse you?
@spelunkerd If we're talking about the same make and model year, oil pressure should rise immediately during cranking...that's why the sending unit is so close to the oil pump and pickup tube. As for driving with no oil pressure: the "idiot light" might be on to indicate "low pressure" but enough there to keep the engine running safely. TOTAL loss of oil pressure would be certain engine destruction within minutes.
I got good pmd and lift pump is new but every now and them truck just stops I figure it is this that is causing my problem would it make it stall if wasn’t working right the pump was working then it stop it stalled about 5 times yesterday I figure I got a bad oil pressure sender switch it’s a 96 the one under the intake plus I’m getting low oil pressure wen idling and hot and it will stall it’s not the pmd or the lift pump ther all working except wen this ops screw up the low oil pressure wnd it stalls like real fast
I have a question I own a 96 astro with a 4.3 ltr now the question is my dash reading little over 40 but the dip stick not reading oil at all I'd like to know why and how to fix it
The dip stick is the most reliable, if there is no oil on the dip stick there is none in the oil pan. It is possible the oil sender is stuck and sending a false signal or shorted and doing the same thing. Drain the oil into a pan and measure how much you get out. If a new oil sender still reports pressure, check the wirng.
I have a 99 lesabre with the same oil sender. Please sir; is this still an issue? I notice that the gauge still reads the same 40 psi even with the car off. The new sender is $38 + $14 for a socket...😐
good video! the one thing i do not like is the diagram shows the sender unit circuit as a switch and it is a variable resistor @ about 1:30. ..and you just stated that in the video lol
The fuel pump switch in the pressure transducer is not a backup, it's a safety device. The ECU only powers the fuel pump during cranking, then the switch in the transducer takes over once pressure builds up. If you get in an accident that breaks a fuel line, you want the fuel pump to stop as soon as the oil pressure drops.
Yea - thought so. Nobody every wants to go on record to say all these extra fancy smancy parts are SAFETY DEVICES! I hear there are a string of sensors in a car that detect an accident condition and make it impossible to start your car because it disengages fuel to travel from the pump into the gas lines. That's why you rarely see a modern guy burst into flames. Only in Hollywood.
mois je vais le réglé le problème je vais éliminé tout ste paquet de criss de cochonerie la qui ocasionne plein de problème er mont truck est toujour aretter et je vais remettre tout mont ancien sistème mécanique de 1983 avec une pompe mécanique avec la pompe a fuel sur le moteur sa sais fiable
I'm restoring a 84 RV 454 V8,I have been told the fuel pump is connected to the oil pressure. Safety in case of accident fuel pump won't run if there is no oil pressure .Engine stops oil pressure drops of and fuel is shut off.
@spelunkerd True, though if you didn't know the system was wired like this you'd think you pulled the wrong fuse cause the engine would keep running. Or worse yet jump to the conclusion that someone jumped something out somewhere in the system. This is just one of those small things that make it had to be your own mechanic. You really have to know your car inside and out.
@spelunkerd The idea here is that running an engine with no oil pressure will destroy it. To this purpose, the schematic makes perfect sense: no oil pressure=no voltage to the fuel pump. The faulty engineering in this case is having the fuel pump circuit hot all the time...this means the only thing turning it off is the sending unit. Therefore a "stuck" sending unit kept the fuel pump running constantly, draining the battery. To make matters worse, it probably overheated the pump, too.
You just answered my question! Best video right here! You win the internet. Thank youuuuu
Thank you very much for this video. For the life of me I couldn't understand the necessity of replacing a $20 sensor part when it ostensibly appeared solid state in nature. Seeing some of the mechanically-activated moving parts internally explained this much clearer to me. And to be smart enough to actually test the old part for failure - that was great!
excellent! Without performing an autopsy on the unit, one can't acquire the info needed to fully diagnose the circuit based on the diagram alone. This video is great!!
One of the best "How it Works" video I have seen on UA-cam. THANK YOU
Great job at explaining the oil pressure switch!
Very good explanation how the sender works. I know why my son's battery was dead and now he is having oil pressure problems. Thank you!
You are a electrical genius, Duane! I wish you were local to me I'd give you all my work!
Everytime I open youtube, i hope there is one video from you guys. I learn a lot with you. Thanks for taking the time to make this videos .
Great video. Using a 1/4" to 1/8" brass reducer I was able to put a sender from a 92 gmc Van into my 85 gmc van. The video helped me figure out the wiring. Works great now (I just connected the gauge wire because there is no second switch on an 85)
Very good information. You guys go out of your way to make things clear.
Thanks for sharing your knowledge.
Great video! Awesome detail and I like how you tore down the bad unit to illustrate how it works!
Outstanding video! You laid that out perfectly and answered the all the questions I had about the sorcery involved in the topic. There are so many 'how it works' pages and videos that just essentially say 'connect this to that and it works!' Maddening! Thank you for filling in all the gaps my friend
Thanks for this end-to-end description. You are a great presenter.
This and other videos you make make one appreciate the engineering involved in the every day car.
This is a great video explaining the inner workings of the switch. I like the way he shows 50 psi air pressure simulates the 50 psi oil pressure. I also like the way he explains how the potentiometer works inside the switch to get particular oil pressure reading, by having a lever slide up and down the spring as pressure changes. The electrical diagram fails to show the variable resistor on the ground side.
Man, this was a very informational and detailedly awesome video! Thank you
Nice work. Very well explained, and demonstrated. Great music.
I feel much smarter after watching this video
Much appreciation
From Baghdad
Nabeel Subhi,
Tom the Iraqi terp
Great video! I always learn something when watching your videos!!
Thank you for the education! It's a 7 year old video, but it's still helping people out!
Outstanding video and lesson. Wow !!! And thankyou so much
Thank you... This is really awesome knowledge
Thank you, best explaination i"ve seen on any site!!
I watched the whole video and learned a lot even though this wasn't the video to answer the question I was currently searching for. A lot of interesting details explained very well. Nicely done my friend!
Just explained why it takes about 45 sec for my fuel pump to shut off on my 90 K5 blazer. Thank you!
Thanks for your video! This really helps in understanding all the complex operations of modern systems.
Excellent description, thank you very much sir!
Great video!
I hope to see more like this!
Thank you.i learn a lot from you than at school teaching me.
Thank you for the lesson...that has helped me out.
Very informative video!
Fantastic best video yet great job thank you
Maaaan you are great, you just fix my car.thanks.
Simply the BEST! Thank You!
Absolutely GREAAAAAATTTTT video!!!!!!!!!!! THANK YOU!!!!
thanks a lot 4 u generosity to share u Knowledge u are a great teacher thanks again God bless u
Excellent video. Thanks!
Thanks for a very informative video!
Excellent 👍
Great video guys!
Awesome video really helped me understand
Well done...
Great job...
Thanks
Amazing!
I had a oil pressure sender go bad on my 98 Buick. The diaphragm had failed causing engine oil to go all over. Put a new one on and it was fine. My car has a light, not a gauge so it probably didn't have a potentiometer. Thanks for posting.
very helpful video thanks!!!
Very detailed. Thanks
great learning video
Great video as always. I was looking for such information and solute to your explanation! Hope I would solve the problem in view of your guidance. Regards,
Thanks, you know how to explain the nuts a bolts of things in simple terms.
awesome video!
AWESOME VIDEO SIR!!! EXCELLENT WORK!! Unfortunately now that you've got the cogs going you have to deal with a question :D
I was wondering if I could use this oil pressure switch and the wiring to add an electric oil pressure gauge to my vehicle. It's a ford. The very bottom of the gauge looks identical but the top half obviously doesn't exist on my cars stock OPS. So I'm curious if this would be a viable option to add an after market oil pressure gauge.
Also anyone who knows the answer FOR SURE can answer this question for me.
That was awesome!
cool well i could say i did fix my 2004 dodge ram 1500 this morning because of this video i have watched a few earlier but this was clearly the best
Great video...tx
great video
Some of these same exact sensors only have a 1 pin connector. So this only applies if your sensor has 3 pins. Otherwise an excellent video that explains it perfectly.
Thank you very much
Good job thx
THANK YOU ARE THE BEST
Thank you for the video; does this apply to 2000 Chrysler Voyager? My oil light is on and the oil is fine; battery is dead now. I was told that it could only be reset during an oil change and then told to change a 9 volt battery to reset the switch. I am not savvy with cars so would I have to send my van to the mechanic?
Respected sir
i love you
So, if I have this same vehicle, when I start the vehicle and unplug the fuel pump relay, the fuel pump should continue running?
A wise engineer links the oil pressure circuit and the fuel pump wiring, planning for those disasters that are avoidable by design.
I'll have to try that some day, (ie take out the fuel pump relay while running, to see if fuel still flows). Great demonstration, Duane.
@happy543210 I appreciate your reply, as I do find what he said at 1:58 to be confusing. Did he word that incorrectly? Looking at the schematic, if power from the fuel pump relay is interrupted, there is still a way for voltage to make it's way to the fuel pump, coming from the oil sending unit, as long as the engine is left on.
I have a 99 GMC Yukon with the one pin connector, much question is can the one pin connector cause the fuel pump not to run
I have a 98 Chevy 1500 4.3l the oil pressure gauge likes to fluctuate. I have noticed it do this while driving in town. If I'm on the highway it runs with a steady reading most of the time. Sometimes while on the highway I notice the gauge needle flicker. Could it be the oil pressure switch sending a false reading to the dash cluster or maybe a ground problem? Any advice would be greatly appreciated. Thank you and I hope i described this in good detail.
@happy543210 I love that idea. But, after I change my oil, for about 6 seconds the engine starts with no oil pressure. And, when driving, if you get a 'no oil' signal from your oil pressure light, the engine stays on until you either pull over or seize the engine, whichever comes first. It doesn't shut fuel delivery off automatically.
Looking at the schematic, if the fuel relay is closed, then pos voltage gets to the fuel pump, regardless of the status of the oil sending unit signal.
what is the minimum oil pressure to work ?
Why does my 89 chevy scottssdale 5.2 have a oil switch or sending unit above the oil filter AND behind the difribular.
@CoolasIce2 GM had a big problem with their wiper fluid heaters a while back because they were also on circuits that were "always hot". Condensation built up inside the reservoir and closed the switch unintentionally, causing the heater to come on and creating a fire in the engine compartment.
My 89 Silverado oil pressure gage and oil pressure switch are separate. One is next to my oil filter and the other next to the distributor. The oil pressure switch only has 2 terminals, so would it be safe to bypass it with jumper only until I can buy another in a few days??
Can you do a video showing the tools you have. You have a lot of andy tools. Thanks !
How hard would it be to replace the oil sender unit on my 96 plymouth voyager 2.4L
Here is my 2 cents. I was trying to pull the oil pressure sensor off of my 1988 s10 but didn't have the oil pressure socket. So I snapped the thing in half to get a regular socket on it (turns out I didnt have a wide enough socket so I had to wrench it off anyways *hardy har har*) but I drove it with broken sensor for 27 miles. The truck ran fine, it stalled coming off of the highway (I was freaking out) but the truck started and ran. My SES still comes on but now I am thinking it is the EGR the IAC valve or the MAPS sensor. So I will replace all of that along with the fuel pump to see if this will help the poor idle and Stalling. It runs rough up until you hit Highway speeds so maybe there is something like a broken vacuum allowing extra fuel into the filter... So to say the least this is going to be fun. I think for the fuel pump to shut off completely you need to actually hit 0 PSI. I read somewhere that if you are at 7 PSI the pump shuts off but I know that engines with a crap load of miles on it wont have as much oil pressure anyways.
Fortunately, GM gave to massive space to change that sensor out on the S10! LOL!
thanks
Good morning. Thank you for the video. Could this also cause the engine to stop after a few seconds of run time. That is if the pressure sensing side is malfunctioning. Would cause the fuel pump to not transfer to the run side of the circuit?
no because it creates an open circuit and therefore woulds not allow it to start
Interesting, I have a 1998 Silverado here that has power to all three leads to the oil sender.
Tq sir
after replacing a brand new oil switch from autozone on my S10 due to leakage, the oil gauge immediately swings to extreme extreme high, passing the maximum 80, more like 120, but 80 is the highest reading. is it a bad switch, any idea please???
Still learning !
To think it stated in 1955 with single wire temp switch !🤓
Great video, I was just woundering if oil can leak through the sending unit where it connects?
Yes it can leak oil
Twice replaced mine ,every 2 yrs.or so it fails 3.8L olds plastic case,mean't to fail?
can a bad oil pressure switch blow my ecm-b fuse causing my fuel pump not to work?
@Bushougoma How can this be since in most 4 cylinders the two piston that come up are on different cycles one exhausts the other is on the compression cycle?
If this part is bad can it make the oil pressure gauge in the vehicle read high? As in completely off of the highest number on the gauge?
Tommy Vapes
Hi Tommy, my gmc truck is reading high at all times, do you find any info about your question?
@VMATT500C As long as the ignition key is in the on position the pump should run. If I understand this correctly, the oil sender keeps the pump running in the event the relay goes bad while the engine is running. If this is the case, I have to say, personally, I'm not a big fan of this backup system
@CoolasIce2 That's what I've been trying to say all along...as long as there's oil pressure (running engine), the fuel pump runs...lose the oil pressure (engine turned off), fuel pump stops...where did I confuse you?
excellent video! my fuel pump wont stay on after cranking. i will test my switch. Thank you.
@spelunkerd If we're talking about the same make and model year, oil pressure should rise immediately during cranking...that's why the sending unit is so close to the oil pump and pickup tube. As for driving with no oil pressure: the "idiot light" might be on to indicate "low pressure" but enough there to keep the engine running safely. TOTAL loss of oil pressure would be certain engine destruction within minutes.
I got good pmd and lift pump is new but every now and them truck just stops I figure it is this that is causing my problem would it make it stall if wasn’t working right the pump was working then it stop it stalled about 5 times yesterday I figure I got a bad oil pressure sender switch it’s a 96 the one under the intake plus I’m getting low oil pressure wen idling and hot and it will stall it’s not the pmd or the lift pump ther all working except wen this ops screw up the low oil pressure wnd it stalls like real fast
No, I would not think this would be the problem. A study of the performance data should lead you in the right direction
I have a question I own a 96 astro with a 4.3 ltr now the question is my dash reading little over 40 but the dip stick not reading oil at all I'd like to know why and how to fix it
The dip stick is the most reliable, if there is no oil on the dip stick there is none in the oil pan.
It is possible the oil sender is stuck and sending a false signal or shorted and doing the same thing. Drain the oil into a pan and measure how much you get out. If a new oil sender still reports pressure, check the wirng.
I have a 99 lesabre with the same oil sender. Please sir; is this still an issue? I notice that the gauge still reads the same 40 psi even with the car off.
The new sender is $38 + $14 for a socket...😐
it easily could be. you need to test it
good video!
the one thing i do not like is the diagram shows the sender unit circuit as a switch and it is a variable resistor @ about 1:30. ..and you just stated that in the video lol
The fuel pump switch in the pressure transducer is not a backup, it's a safety device. The ECU only powers the fuel pump during cranking, then the switch in the transducer takes over once pressure builds up. If you get in an accident that breaks a fuel line, you want the fuel pump to stop as soon as the oil pressure drops.
Yea - thought so. Nobody every wants to go on record to say all these extra fancy smancy parts are SAFETY DEVICES! I hear there are a string of sensors in a car that detect an accident condition and make it impossible to start your car because it disengages fuel to travel from the pump into the gas lines. That's why you rarely see a modern guy burst into flames. Only in Hollywood.
mois je vais le réglé le problème je vais éliminé tout ste paquet de criss de cochonerie la qui ocasionne plein de problème er mont truck est toujour aretter et je vais remettre tout mont ancien sistème mécanique de 1983 avec une pompe mécanique avec la pompe a fuel sur le moteur sa sais fiable
martin daigle lol
many cars have a switch in the trunk, mostly fords, lincolns that will trip in the case of an accident and the car wont run until reset
i tought that if it lowered resistance the gauge goes up not down
I'm restoring a 84 RV 454 V8,I have been told the fuel pump is connected to the oil pressure. Safety in case of accident fuel pump won't run if there is no oil pressure .Engine stops oil pressure drops of and fuel is shut off.
That is most likely true, the electrical diagram will tell you exactly how that is accomplished
1993gmc vandura my oil pressure reads but my fuel pump doesn't read
@spelunkerd True, though if you didn't know the system was wired like this you'd think you pulled the wrong fuse cause the engine would keep running. Or worse yet jump to the conclusion that someone jumped something out somewhere in the system. This is just one of those small things that make it had to be your own mechanic. You really have to know your car inside and out.
@spelunkerd The idea here is that running an engine with no oil pressure will destroy it. To this purpose, the schematic makes perfect sense: no oil pressure=no voltage to the fuel pump. The faulty engineering in this case is having the fuel pump circuit hot all the time...this means the only thing turning it off is the sending unit. Therefore a "stuck" sending unit kept the fuel pump running constantly, draining the battery. To make matters worse, it probably overheated the pump, too.