It took a few bucks before I found out that all I needed was a new lift pump!
My upgrade happened two weeks ago from the diaphragm lift pump to a piston pump.
I tested it out with a 400-mile road trip. After replacing the LP, with all my other upgrades seemed to all finally flow together. My power is up at least 30% now. My old stock lift pump was not supplying the injection pump with enough charge. I always felt it was a fuel delivery problem.

Don’t know if any of you have ever replaced a lift pump and noticed a difference, but t happened to me and I'm pretty darn happy about it, I just found out I have a Hot Rod!

 

Same thing happened to me. Truck idled better, pulled harder and would rev faster. Also made my injection pump a lot quieter! Gotta love proper lubrication.

 

Something to look into. I can suck my FP down to 0 if I dont watch it, but I do have 7K on SE MO fuel, so it could need a change.

DP

 

Where did you get the pump? I have been looking into getting a new lift pump. What did it cost? Thanks!

 

Thanks Gents!

I bought the Pump at the Cummins building in San Leandro.
The pump and extra parts for the pump all came to $200.

Regards

Dunn

 

Has anyone tried the lift pumps off ebay? I called my local Dodge dealer a couple days ago and the lift pump costs $144.00 from them. From ebay I can purchase a lift pump for $49.00. What is the difference? Are Mopar parts that much higher than Delphi or any other brand? Thanks!

 

You guys with big injectors really ought to consider a Walbro setup instead of the piston pump. It doesn't cost much more and you WILL have good fuel pressure. It's easy to drag a piston pump down to 5 psi.

 

I`ve been running one since the summer, no problems so far.

 

dave can the walbro system be used in conjunction with a stock diaphram lift pump?

 

Yes, it would work the same way as mine. There's a check valve on the outlet of all the mechanical lift pumps.

Not to toot my own horn too much, but what I really like about my way of plumbing the fuel system is that you still have the stock setup for backup.

 

do you keep the walbro on most of the time, or just when you are pounding it?

 

The Walbro relay is triggered off the valet switch - so when I'm playing the Walbro is pumping. The piston pump can maintain 10 psi in valet mode, which is adequate.

There's no reason a Walbro couldn't run all the time, but I'd take a shim out of the regulator to get the fuel pressure down around 15 psi if I was to run it all the time.

 

Just wondering... What is too much psi for the injection pump?
Can too much psi from the lift pump cause problems?

 

Yes, you can blow out the front pump seal. Supposedly it happens between 20 and 25 psi. I have not tested this hypothesis myself...

My Walbro is regulated to 18 psi because that's what the piston pump would run going downhill. I figured if it ran that way for a year it was not too high.

 

Let me get this all absorbed.

Wanna, you have an electric Walbro fuel pump that has it's pressure end tee-ed into the fuel system between the mechanical pump and the injection pump, such that you can run on the mechanical, and flip on the electric at will??

Do you have a Walbro link??

Why the Walbro, and not the FASS??

Thanks.