Marine Gasoline Engine Repair, Gas engine electric fuel pump conversion. (Part 1)
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- Опубліковано 11 вер 2020
- In this video I am working on replacing an old mechanical diaphragm gasoline fuel pump with a Carter electric design. There are several challenges to this. This is part 1 of 3.
Part 2 is now finished and published.
Those engines are the best ones for a high school automotive class! Great video, I am going to convert both of mine to this!
Thanks for the positive feedback! - There are thousands of these engines out there in the marine world and they are the best to teach on for new students.
The boot should push over the white terminal insulator...push the wires on all the way, then the clip should work
Great idea making a bracket to block off that old mechanical fuel pump and use it to hold the electric fuel pump!! I wish I could come take some classes with you. I have been a Nissan auto master tech for 32 years. I like working on boats in my spare time.
Scott,
We do have a lot of "cross over" auto techs, thanks for the feedback! And please pass to any younger folks who want to learn a great trade and enter into a very lucrative job market.
To get the electrical connects done right, you must push the boots on further than he is showing. Once that is done. The clip will fit correctly. Slight modification m8ght be needed to the clip.
Thanks I need to do this this month
Great Idea Sir
Great idea. Try double nut,
You didn't push the connectors on far enough. The rubber boots expand over the the plastic if you push it on harder.
I know now......... but trying to put that on a Marine power big block with the pump way down under the fuel bracket is a nightmare.
You didn't push the wire connectors on high enough. The boots on the wire goes over the white part, just keep pushing.
Understood. I did this on a Marine Power engine due to not being able to see the terminals and took the pump off to thread the posts so I knew the connections were good.
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Perfect must be sunny where you are, or are you just a firestarter. I want try the same thing with a ported crankcase 2 cylinder outboard engine, but am to scared it will start a fire. Have you seen the electric fuel pumps on lawnmowers yet?
Thanks for a helpful video. I overcame the problem of the clip falling out by drilling a very small hole through the plastic between the terminals and inserting an equally small screw thereby locking the clip into place in the plastic, but can anyone enlighten me as to what the loose small grey cap like part is for? Thanks.
thats a wire nut it connects two wires together not usually used for permanent use though
@@jacobgomer many thanks for your help Jacob.
Great video. I'll also fabricate a stand off bracket. Which oil pressure switch did you end up using? did you also end up installing a temporary priming switch, or was the timing for the oil pressure switch quick enough to get fuel up to the carb? Thanks.
Holley 12-810 wired through the pull in coil side of a full ISO relay. Then fused 10amps to the pump from the relay. I was going to install a standard PS-64 switch but it got bad reviews. You can run a wire off the starter solenoid wire as well (for power while cranking) but you will need a diode installed in that circuit so the oil pressure switch doesn't' back-feed into the starter solenoid circuit after you have oil pressure.
@@tedsmarinerepair8956 Thanks. I also looked at the PS-64 and agree the reviews were bad.
What psi do the old stock pumps make? Don’t know if I am going to need a fuel pressure gauge
From MerCruiser Book #17 all mechanical fuel pumps used on GM V6 and V8 engines have a fuel pressure range of 5-7 psi. I use 4-8 because not all mechanical gauges are perfect.
Carter Electric fuel pump! Got it. Did it keep up when you ran the boat? I have a Mercruiser 3.0 with fuel delivery problems. My mechanical pump is new so I don't know why . Nice weld buy the way. Thanks for sharing.
Yes. These pumps work on engine up to 7.4L if you still have fuel issues try running the boat off an outboard tank. If it runs great off that, you have an anti-siphon or fuel tank pick up issue..
Ted watched your Carter Fuel Pump Part I and would like to watch Part II. Where is it available? Cannot find it. Lee N
Lee,
Sorry for the delay......It is on my list to finish. And thank you for the notification, just been a very busy term for me at the college.
Great video.. Hi got a question what size threading that goes in the pump ?
It's 1/8" or 1/4" pipe threads. Can't remember which one
Great video - Does the pump provide some pressure regulation or does it run wide open all the time, dumping all mu fuel into the engine...?
My 4.3 is a EFI, btw.
All electric pumps have some type of internal pressure regulator. And yes they run constant while the engine is running.
I install this pump on a 350 Chevy engine on a boat and some times brings gas and then the fuel stops, the pump its running but no fuel come to the glass filter just before the carburetor. what a my missing??
Hi, great video, wondering when part 2 will be uploaded? I’m about to do the same thing and you’ve left me hanging. Hahaha.
Sorry for the delay, I am teaching several courses and finishing up with boat work for the season. Hope to get that one done in the next month!
Thanks for the feedback!
Hi again, just wondering if these pumps can be inverted? The space I have, the pump sits better up the other way to yours, but can you do that?? 😬😬 Cheers.
@@sleepbus
The installation instructions do state "Install with the wiring connections facing down". So that is the way I have installed them.
I whish that the bracket made to support the fuel pump is for the demo only, with the weight of that pump and the vibration pattern of that engine at high RPM, it will break at the weld bead at the original pump blocking plate. AS a rule of the thumb, any accessorie attached to an engine should be attached in a 3 dimension mode.
I've made many conversion of auto engines to marine use and I observed that many brackets made for light duty automotive use are not sufficient for substained high RPM marine use.
For the electric, I use a relay that I trigger by a diode array and an override switch, I use the starter signal, the alternator diode trio signal and the oil pressure switch signal
The pump is isolated on three rubber vibration mounts and the steel I use is 3/16" plate, my welds have a smooth radius angle with no 90 points, so I am quite sure it will never fail.
Agreed any cheap automotive junk brackets anyone puts on a marine application is never recommended.
The wiring you state is exactly what volvo conversion's to electric pumps is. Just ensure the Diode you use does not cause excessive voltage drop or the pump rotation will be inadequate and it will overheat and fail prematurely.
@@tedsmarinerepair8956 I use the diodes to trigger the relay that feeds the fuel pump.
@@jacquespoirier9071 That works best
Could you leave the old pump in place to block hole and mount fuel pump in a different area if you have the room .
yes that would be an option to leave it installed.
Hello Ted, I installed an electric fuel pump in my 1985 Merc A1 G1 3.0L 140hp. It's running ok but has some issues at times starting when it's hot. Question what is the normal recommended psi for my engine. I think I may have purchased an electric pump that may be too high in PSI. That's why I'm asking what my engine requires. And Thanks for all the great videos.
Try pumping the throttle if it's hot and won't start (enrichens the fuel) if that doesn't work, try holding the throttle wide open and crank it to see if its flooding - if it starts then yes maybe the fuel pressure it too high. also when it's hot try taking off the flame arrestor, have someone turn the key on and look down the carb to see if fuel in pouring down the throut when the pump is running (not cranking over). ALWAYS put the flame arrestor back on prior to starting.
That works on newer but old carbs don't have clear flood @tedsmarinerepair8956
What do you do with overflow tube off the carb?
Their is no use for it. Plug it.
Just got stranded this past weekend because my clip slipped out after 800 miles of driving. Pathetic design. Good idea sir
Your not the only one this has happened to. Hope you found it quickly and used a "tie wrap" to hold in on until you got back to port!
What was the part number on the electric fuel pump?
Carter P4594
Where’s part two?
Part 2 please boating season is close...
I am working on it.....stay tuned
When's the next video in this series Ted?
Work in progress.......
@@tedsmarinerepair8956 cool thanks Ted!
NO! You can't mount it upside down. Says so in the information.
Interesting, every marine power engine I've worked on has it mounted in the same way.
Not impressed with the quality of those carters...plenty of issues
Do you have another type you can recommend?
@@tedsmarinerepair8956 of 3 carters, 2 failed basically right of the box( one of them the pump worked but the pressure control not). I hav now switched to the german HÜCO, i does not look anything special but they hav a good reputation. The 120-130 L capacity is enough for my basic marine SBC , but for tuned engines maybe on the low side.
@@XSAILOR65 I gather your in Europe, I will have to check into the availability here in the US of the HUCO fuel pumps, and it sounds perfect for most Carburetor engines.
Thanks for the info!
@@tedsmarinerepair8956 Believe there are a few seller on e bay, not sure they will ship to US bur guess they will.