Thread: How long should fuel pressure hold with koeo

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  1. #1 How long should fuel pressure hold with koeo 
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    Mine goes from 42ish down to zero in just under a minute. Not sure if something's wrong with the pump or not.

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  2. #2 Re: How long should fuel pressure hold with koeo 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    It shouldn't bleed down that quickly.

    SMGPFC Member #1
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  3. #3 Re: How long should fuel pressure hold with koeo 
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    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.

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  4. #4 Re: How long should fuel pressure hold with koeo 
    Turbo is the way to go. BillBoost37's Avatar
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    FSM says after you have bled out the gauge, that it should hold for 10 min
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  5. #5 Re: How long should fuel pressure hold with koeo 
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    Quote Originally Posted by BillBoost37 View Post
    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?

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  6. #6 Re: How long should fuel pressure hold with koeo 
    Turbo is the way to go. BillBoost37's Avatar
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    Quote Originally Posted by tweeder View Post
    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.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  7. #7 Re: How long should fuel pressure hold with koeo 
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    Oh, i have a guage permanently mounted at the shrader valve.

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  8. #8 Re: How long should fuel pressure hold with koeo 
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    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?

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  9. #9 Re: How long should fuel pressure hold with koeo 
    GXP Level Member Turbocharged400sbc's Avatar
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    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+)
    ~James~ Psychotic Gearhead
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  10. #10 Re: How long should fuel pressure hold with koeo 
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    Quote Originally Posted by Turbocharged400sbc View Post
    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

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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