Thread: How long should fuel pressure hold with koeo

Mine goes from 42ish down to zero in just under a minute. Not sure if something's wrong with the pump or not.

It shouldn't bleed down that quickly.

It keeps up at idle and goes up with a manual rev of the throttle. So I assume it's keeping up at wot. It's an aftermarket race pump, 300lph.

FSM says after you have bled out the gauge, that it should hold for 10 min

Originally Posted by BillBoost37

FSM says after you have bled out the gauge, that it should hold for 10 min

How are you supposed to tell if it's holding pressure if there's no guage attached?

Originally Posted by tweeder

How are you supposed to tell if it's holding pressure if there's no guage attached?

You attach one. If you are looking at pressure, then you must have something to look at the pressure with..aka a gauge.

Oh, i have a guage permanently mounted at the shrader valve.

i forgot to mention that it has a new fuel pressure regulator. I also have the pump assembly out and in a bucket of fuel, how do i test it and what am i looking for?

i have yet to see a high flow aftermarket pump with the anti bleedback valve blocking/restricting that tiny ass fuel feed nipple.

1 minute bleed down is quite good for not having the oem checkvalve (which is the only way the system will hold pressure longer than a minute...)

the cure is a change in your starting tactic/training yerself.

key on, pause for 1-1.5seconds (as the pump nears the end of prime, then start cranking either after its stopped priming, or before if you get really good at it (might as well save yer FP relay some wear and tear)

you get used to it.

or you can kneecap your sweet high flow pump down to 180lph by reinstalling the factory checkvalve.

id compromise on the startup sequence...

in short...your fine as long at KOEO yer FP is 48-52 ish or ~58ish on the deadhead fuel system cars (04+)

Originally Posted by Turbocharged400sbc

i have yet to see a high flow aftermarket pump with the anti bleedback valve blocking/restricting that tiny ass fuel feed nipple.

1 minute bleed down is quite good for not having the oem checkvalve (which is the only way the system will hold pressure longer than a minute...)

the cure is a change in your starting tactic/training yerself.

key on, pause for 1-1.5seconds (as the pump nears the end of prime, then start cranking either after its stopped priming, or before if you get really good at it (might as well save yer FP relay some wear and tear)

you get used to it.

or you can kneecap your sweet high flow pump down to 180lph by reinstalling the factory checkvalve.

id compromise on the startup sequence...

in short...your fine as long at KOEO yer FP is 48-52 ish or ~58ish on the deadhead fuel system cars (04+)

Ok thats good to know, thanks. I have no problem starting as soon as i turn the key