Engine/Transmission (1994 - 1998) Electric Fuel Pump To Replace Lift Pump?

[MMcCallie]

My no cold start thread didn't get many hits so i'm starting a separate post. I believe my lift pump is going out so instead of replacing it, i'm wondering if i can just add an inline electric fuel pump.



Will the failing lift pump allow the extra fuel to be pushed through it? Is a constant 60 psi too much to send through the lift pump, fuel lines, filter, etc? Should i use a regulator and if so, what psi should i limit it to? Will the 12 valve have the same problems the commonrail 24 valve engines do with aftermarket electric fuel pumps?



I still have my old 7. 3 PSD inline fuel filter which used to be mounted to the frame. I'm thinking of reinstalling it so i won't be stuck again with an engine that won't start. If ya'll think i should stick with just a mechanical lift pump, where do you recommend i buy it for the best quality?



Suggestions?

Thanks,

Matt

 

[EKlem]

I would recommend sticking with the stock mechanical pump. They are known to be very reliable and flow a lot of fuel. As far as where to get them, you can get them from your dodge dealer and a lot of the aftermarket places. I know that people have posted about finding them pretty cheap but I just can't remember where. When I had to replace mine, I got it from the local dodge dealer because I was in a rush but I probably could have gotten a better price.

 

[MLee]

If you do a search you can find a lot of discussion on where to purchase, There are tractor dealers, a good price, Frieghtliner parts depts. Cummins, The average $150 to 175. Piers has a good price. just for you information.

Marv.

 

[Howard Durand]

Before you replace it, make sure it is the problem. Those pumps are pretty tough. I thought an electric pump would be a good idea also but when you consider the fact that the mechanical pump delivers fuel at a rate required by the engine, it is the best choice.

Leaky fuel lines and heaters probably cause more pumps to be replaced than anything. Mine included.

Read some of the posts by Joe G. He has a good description on how they work and what needs replacing. Usually new "O" rings that you can get at the local Ace Hardware will fix them.

 

[WDimig]

i got a FASS 150/180 1010 coming to me tomorow, will let everyone know how the good o'le 12v like 45psi @180gph once i get it on the truck, no doubt that the mechanical lift pump will flow alot of fuel, but i want more! and with better filtration!



wes

 

[MMcCallie]

I've been told the Ford 7. 3 Power Stroke electric fuel pump puts out a consistent 60 psi. That is way too much flow. While i know i could put a regulator on it, it still wouldn't ever adjust pressure as does the lift pump with RPM. Everyone i've asked has recommended i stick with the lift pump. While i haven't had any solid reasons why, i figure i'll stick with everyone's advice.

I'm planning to order a lift pump from Piers for $129. They also suggested i replace the overflow valve, that that is the only other thing likely to be causing my hard starts for another $55. Their mechanical fuel pressure gauge kit costs $142 so i figure i'll be ahead if i just go on and replace both possibly bad parts and keep the old ones as spares instead of the gauge. I'll be surprised if both the overflow valve and lift pump are really bad but hope to cure any potential problems this way. I also plan to order their 4KGSK since i already have 60 lb. springs.

 

[PKemp]

I would have to echo Howard. Unless your a sled puller or drag racer the stock pump in a 12 valve with a P7100 will put out all you will ever need and its "in time" with your engines demands.

The big guys like Forrest who have fire hoses for injectors (sorry Forrest, just kidding... ... I think) need the volume as well as constant high pressure to feed thier creations. Thus high volume/high pressure electric pumps. I believe even Forrest uses a cut-off device to revert back to a mechanical pump when he isn't setting new records, or experimenting with crazy stuff. Higher pressures (psi) don't always mean higher volume. Remember too that very high fuel pressures are also harmful to the softer metal parts of your injector pump's body, dv's, lines and injectors and overflow valve. In your case more isn't better..... stick with the mechanical pump.