fuel pressure question..

[vr4gasm]

what the hell should my fuel pressure be at? when i first installed my gauge i was at 48lbs idle and load well a few days go by i am now at 51ish idle and climbs to upper 50s under a load... why is it doing this?

[ssms5411]

Re: fuel pressure question..

Mines at 48 when first started and at WOT it will go to 52-54 PSi and then after it is hot , my idle at a light will be 46-48 PSI. This is with a Walbro 255 high flow.

[vr4gasm]

Re: fuel pressure question..

mine is through a 100% stock fuel system with 90xxx miles it just sounded high to me

[ssms5411]

Re: fuel pressure question..

Sounds like its running strong so most likely it will go out soon.LOL

[vr4gasm]

Re: fuel pressure question..

i need to upgrade anyways lol

[dgreet77]

Re: fuel pressure question..

My stock pump idles at 42.5 or so, climbs to 50 or slightly above under load.

[Cammy98]

Re: fuel pressure question..

I have a 52 at idle

[xcdarrel17]

Re: fuel pressure question..

My stock pump idles at 42.5 or so, climbs to 50 or slightly above under load.

I'm gonna pull this thread up for my question.

Car used to idle at 42.5 and rise under load as quoted above. Now it is idling at about 50 and goes no where under load. What would cause this? Anything other than a bum FPR?

[Rob Bell]

Re: fuel pressure question..

I would start with the FPR. My guess is that the FPR is stuck, but the pump provides enough pressure that it's able to keep the pressure steady, even with more fuel going out the injectors. Try flooring it to see if the pressure drops at all. I think that would be a definite indicator of a bad FPR.

Please no nitrous though LOL

[EarlR]

Re: fuel pressure question..

I'm gonna pull this thread up for my question.

Car used to idle at 42.5 and rise under load as quoted above. Now it is idling at about 50 and goes no where under load. What would cause this? Anything other than a bum FPR?

Not sure about the Camaro, but I know other systems use vacuum to the FPR to reduce fuel pressure under no-load conditions. If the vacuum is not there, or the FPR is not working properly the default would be the higher pressure.

[xcdarrel17]

Re: fuel pressure question..

Not sure about the Camaro, but I know other systems use vacuum to the FPR to reduce fuel pressure under no-load conditions. If the vacuum is not there, or the FPR is not working properly the default would be the higher pressure.

Bingo! Vacuum line came off the FPR. I love it when things are an easy fix. It usually doesn't work out that way.

The good news is (for you nitrous guys) the FPSS is what saved me at the track and why my nitrous stopped kicking in. No vacuum line hooked up to the FPR means the system couldn't jack the pressure up to where it needs to be with a dry kit. FPSS does it job and doesn't allow the second solenoid to fire = I still have an engine.