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So I got rid of the not so reliable low fuel pressure warning light system that was giving me some false alarms or so I thought. Anyway I installed a Stewart Warner mechanical F/P guage this evening piped in off the schrader on the injection pump. Now this is what sucks, I am only getting 6psi at idle and it drops right to 0 at WOT. I just installed a new lift pump and put in a new fuel filter about 2 or 3 weeks ago. So What are you guys getting for psi off the stock lift pump in the stock location? I'm thinking maybe this Lift pump is a dud.:CRY:
 

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Discussion Starter · #2 ·
I also forgot to mention I just picked up a Hypertech programmer and have it set on stage 2. Could that affect my fuel pressure reading?
 

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I had the exact same experience. I replaced a frame mounted Carter lift pump when mine started dropping below 7 PSI. Got a new one and it was 6 PSI right out of the box. I installed a FASS HPFP95 and a 3/8" line and haven't seen less than 16 PSI since.
 

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Mopar1973Man.Com
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So I got rid of the not so reliable low fuel pressure warning light system that was giving me some false alarms or so I thought. Anyway I installed a Stewart Warner mechanical F/P guage this evening piped in off the schrader on the injection pump. Now this is what sucks, I am only getting 6psi at idle and it drops right to 0 at WOT. I just installed a new lift pump and put in a new fuel filter about 2 or 3 weeks ago. So What are you guys getting for psi off the stock lift pump in the stock location? I'm thinking maybe this Lift pump is a dud.:CRY:
MINIMUM PRESSURE is 10 PSI @ WOT!



You need a fuel pump badly before you ruin you VP44...:thud::$:

In stock location with stock pluming I was getting 13-14 PSI... 10-11 @ WOT with a fresh pump!

Here is my current pump and its worth every penny! (Pic Clickable)


All these LOW PRESSURE lights are setup totally wrong... The light should be on at 10-11 PSI period not at 5 PSI... The stock carter pump cannot pass the volume test at below 9 PSI at all...

Here is the TSB fuel pump diagnostic from Dodge...
Lift Pump Diagnostics
 
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