Amazed with the difference in power
#1
Registered User
Thread Starter
Amazed with the difference in power
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!
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!
#5
Registered User
Thread Starter
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
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
#6
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!
#7
Adminstrator-ess
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.
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#8
Registered User
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!
#10
Adminstrator-ess
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.
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.
#12
Adminstrator-ess
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.
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.
#14
Adminstrator-ess
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.
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.
#15
Registered User
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.