Thread: No power to fuel pump relay from PCM? *Update issue resolved*

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  1. #21 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
    GXP Level Member txslow6's Avatar
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    Quote Originally Posted by matt5112 View Post
    I was reading that and thinking "**** no...." then I saw the SSIC haha.
    LOL. Since I've owned one I always try and steer people clear of them. They are junk and anyone who is considering one needs to skip it and buy a full-size.
    85 Corvette
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    03 Z06
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  2. #22 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
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    Might just have one already...

    I need valvetrain mods....

    Have to say though, beat on it for an hour today.

    Didn't see the aero flashing at me saying it was seeing 1* of KR or more.

    Very impressed.
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  3. #23 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
    GXP Level Member txslow6's Avatar
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    Quote Originally Posted by matt5112 View Post
    Might just have one already...

    I need valvetrain mods....

    Have to say though, beat on it for an hour today.

    Didn't see the aero flashing at me saying it was seeing 1* of KR or more.

    Very impressed.
    Once you get to a 3.0 pulley the ic becomes a moot point.

    For a mild setup it will get the job done. But who has a mild setup on these cars? Once you start adding mods and hear the blower scream bloody murder it's hard to stop.
    85 Corvette
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  4. #24 Re: No power to fuel pump relay from PCM? 
    GT Level Member RegalGS98s's Avatar
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    Quote Originally Posted by txslow6 View Post
    Problem is solved. 1 is my stupidity by bending the wrong tab during diagnosis. I bent tab 36 instead of tab 85. *FLAME SUIT ON*

    Next is my awesome PCM that came with the ct turbo kit I purchased from Kuntzie. In laymans terms it's junk and is what's causing the spariodic cutout issue. They're 99.9% sure it's an internal issue. Thanks buddy.

    So to remedy the situation I will be purchasing a tuned PCM from ZZP.
    Damn, glad you got it figured out though. I laughed at the FLAME SUIT.
    SMGPFC #0330 - 3.25, Intercooled, Custom Tune, 1.84rr, LS6 Springs, roller timing chain, SLP Headers, Borla Exhaust, built Trans, B&M Trans Cooler, home cut poly uppers, gapless rings, N* TB, Ported heads.
    Soontocome: CAM?, Custom modified M112, home poured Poly Engine and Trans mounts
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  5. #25 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
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    Quote Originally Posted by txslow6 View Post
    Once you get to a 3.0 pulley the ic becomes a moot point.

    For a mild setup it will get the job done. But who has a mild setup on these cars? Once you start adding mods and hear the blower scream bloody murder it's hard to stop.
    I have several remedies in mind...
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  6. #26 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
    SE Level Member JcGTP39's Avatar
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    Im kinda going through the same promblem. Well about 2 weeks ago i went to go start my car and it wouldnt start so i thougth maybe it needed new plugs and wires cause they seemed kinda old so i replaced them and still wouldnt start, so i checked the fuel rail and there was no fuel pressure to the rail and i didnt hear the fuel pump turn on so at first i checked the fuse and the fuse was good so i ended up switching the realys around the fuel pump and the the fuel pump speed control then i turn the kee then heard the fuel pump turn on and the car started. then the same thing happens if the car sits for a few hours but sometimes it takes few times switching the relays around for the pump to get power. Then one night I was on the highway I could feel my car bogging then it died everything was still working just the engine just shut off, pulled over then turned the key off and on a few times then turned it over it started up i gave it some gas then it quit again so then i got out pulled the relays switched them than bam fired up drove back home with out any promblems. Should I get a PCM tune? Fuel pump? or whatever someone help.
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  7. #27 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
    I live here. brandonl2000's Avatar
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    could be the fuel pump. have you tried the fuel resistor by pass deal to rule that out??

    http://www.scacgp.com/mods/fuel_fix/relays.jpg
    2003 Grand Prix GTP-3.5 setup, sold it, miss it
    2002 Grand Prix GT-top swap, GT1 Cam, SD Headers, 90# springs, 42.5 injectors, 3.4 pulley - sold
    2012 Chevrolet Cruze LTZ-Summit White, 1.4Turbo
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  8. #28 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
    GXP Level Member txslow6's Avatar
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    JC GTP
    Another issue I was having is the fuel pump relay would become disconnected from the pins on bumps causing it to cut out like it was losing fuel.

    If you don't have a fuel pump rewire then try the above method posted with the fuel pump resistor mod.

    You should double check the battery to see what power it's putting out.
    85 Corvette
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  9. #29 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
    SE Level Member JcGTP39's Avatar
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    Okay thanks so much. I don't think the relay comes out because they all seem to be tight. But I'll try the resistor mod and see what happens thanks for the help
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  10. #30 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
    I live here. brandonl2000's Avatar
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    not a problem sir. may or may not do the trick, but if it doesn't then you know what it ain't.
    2003 Grand Prix GTP-3.5 setup, sold it, miss it
    2002 Grand Prix GT-top swap, GT1 Cam, SD Headers, 90# springs, 42.5 injectors, 3.4 pulley - sold
    2012 Chevrolet Cruze LTZ-Summit White, 1.4Turbo
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  11. #31 Re: No power to fuel pump relay from PCM? *Update issue resolved* 
    SE Level Member JcGTP39's Avatar
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    Well I changed out the o2 sensor on the manifold and so for the car hasnt acted up(knock on wood) i didnt bother changing it because I wouldnt think it would effect it. So i dished out thr 62 dollers for one and she's now running like a champ
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