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Fuel pump runs continuously--electrical prob?

posted by  someone claiming to be RON on  Sun Oct 3 00:32 CST 2004 [RELATED]

Hello all. In an August '04 response, garyh said with respect to this problem (fuel pump running continuously with key turned to II and motor off) on another owners vehicle that besides the FPR or check valve, this problem could be occurring because

"the coil voltage is on continuously, indicating another electrical problem".

Does anyone know what this "other electrical problem" he is referring to might be??? I have the same problem with my 760 turbo wagon along with apparently low fuel pressure (i disconnected the fuel line from the rail and fuel just drizzled out, no spray from high pressure release). I'm also experiencing poor power in high demand situations like climbing hills and hard acceleration.

I just replaced the check valve and replaced the FPR about 6 months ago. No fuel leaking out of the FPR when I remove the air hose. I can hear a buzzing from the prepump and also from the main pump, so I am assuming they are fully funcional. I would really appreciate some input if anyone has an idea on this!

Thanks all. Great site!!!







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    Fuel pump runs continuously--electrical prob?

    posted by  adrian on  Sun Oct 3 04:28 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sun Jul 21 12:55 CST 2013
    [RELATED]

    Hi Ron,

    If its on all the time it could be your fuel pump relay again. Give it a little love tap and see if it frees up. If not, try another known working relay in its place. If that doesn't work, there could be a short in the system you'll have to track down.

    About your fuel pressure problem, when was the last time your filter was changed?

    Post the outcome,

    Adrian







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      Fuel pump runs continuously--electrical prob?

      posted by  someone claiming to be RON on  Sun Oct 3 21:06 CST 2004 [RELATED]

      Hey Adrian, thanks for responding. I changed the fuel filter about 6 or eight months ago as well. I also suspected the fuel injection relay could be causing the problem so i replaced it just a couple of weeks ago--to no avail. it's possible that the new one is bad too, but i doubt it. I'll give it a tap or two just to see.

      When you talk about a "short" elsewhere in the system, do you mean a loose wire or poor ground--something like that? Anything in particular I could check out? Other possibilities?

      Thanks again for your help. Ron








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        Fuel pump runs continuously--electrical prob?

        posted by  adrian on  Mon Oct 4 14:31 CST 2004
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Sun Jul 21 12:55 CST 2013
        [RELATED]

        Hey Ron,

        What I mean when I say a "short" is that a hot wire (+12) could be shorting to ground which means something stays on or off or eventually blows a fuse.
        Also check all of your grounds that pertain to the fuel system and wiring harness connections.
        My father was having an intermittent charging problem for the longest time on his 88 Chevy pickup. He bought a new alternator thinking that was the problem, didnt work. Upon further investigation, it turned out to be a corroded ground going to the frame.

        Good Luck

        Adrian







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