Engine/Transmission (1998.5 - 2002) Fuel pressure variations

[BHowayeck]

Just installed the new "juice with attitude"- my fuel pressure is varying drastically, from 12psi down to 3psi at idle. Does my fuel pump need to be replaced? Is this typical of a fuel pump that is worn? Please help!

 

[elandon1201]

Yes you should verify with a manual gauge but mine is holding 18PSI to 15PSI WOT with the new FASS

 

[Dipstick]

I just installed a Westech Fuel Pressure Gauge and with the org. Lift Pump and 46,000 on the clock I push 16 psi at idle or just driving along and with my foot in it the pressure drops to 12 and may bump 10 on a hard pull. I suspect there is something being lost in your fuel pressure system and it is probably the lift pump. Good luck.

 

[johncameron]

Just installed the new "juice with attitude"- my fuel pressure is varying drastically, from 12psi down to 3psi at idle. Does my fuel pump need to be replaced? Is this typical of a fuel pump that is worn? Please help!

Check you lift pump ASAP. Those cheap stockers can die in less than 3 months, it happened to me. If you can afford it look into an aftermarket fuel system.



JC

 

[480RUGER]

I have a Carter pusher and lift pump with PowerByPoole's big line kit and had great pressure till my VP44 went out. It was 20 PSI @ idle and no less then 15 PSI @ WOT (Smarty #8 and Comp 5X5). The VP44 was weak for the last 30K miles so I feel it had nothing to do with the new pressure. Now after the VP44 swap my gauge jumps all over the place at idle and cruising speed (7-20 PSI). If I pump the gas the pressure jumps to a solid 20 PSI. I'm still looking for the cause but not as worried as I should be because anytime I get on it the pressure jumps back up. Hopefully this thread will help us out.

 

[azpete]

Low or varying pressure at idle or crusing. Hit the peddle and the pressure would go back up. I replaced the LP and problem went away.

 

[johncameron]

Low or varying pressure at idle or crusing. Hit the peddle and the pressure would go back up. I replaced the LP and problem went away.

Same thing for me on my last stock pump!!!!!