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Thread: Pulled fuel pump today. 2.6 ohms. Good or bad?

  1. #1
    Join Date
    Jan 2006
    Posts
    370

    Default Pulled fuel pump today. 2.6 ohms. Good or bad?

    I have been having problems with my car not starting. I didn't have spark, but now I do. Replaced coil, and that solved this problem. Fuel pump not working either. Replaced relay, and not the problem. Pulled the pump today, and ohmed it out. 2.6 ohms. Good or bad. did a search, and came up with nothing. Anybody know what the ohms are? 89 535i M30
    Thanks......Felix

  2. #2
    Join Date
    Mar 2006
    Location
    Derbyshire, UK
    Posts
    872

    Default

    Hook it up to a 12 volt supply. If it pumps, it works.

    1997 535i V8
    5spd, OBC, A/C, cruise, BMW phone, factory M-Tech wheel & suspension, 18" Alpinas

  3. #3
    Join Date
    Jan 2006
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    370

    Default

    That I will do. I was going to do this anyway, but just wanted to know the details. I think it would be good to know. Thanks Dave.
    Felix

  4. #4
    Join Date
    Apr 2005
    Location
    Canada
    Posts
    222

    Default

    Quote Originally Posted by Felixdacat
    I have been having problems with my car not starting. I didn't have spark, but now I do. Replaced coil, and that solved this problem. Fuel pump not working either. Replaced relay, and not the problem. Pulled the pump today, and ohmed it out. 2.6 ohms. Good or bad. did a search, and came up with nothing. Anybody know what the ohms are? 89 535i M30
    Thanks......Felix

    The Bentley manual do not give the fuel pump resistance but they say that the pump may drain a max of 5 amps (the fuse is an 7.5 amps). As per Ohm law V=R x I or R=V/I where V=12 volts and Imax=5 amps, that give 12/5=2.4 ohms which is very close to the 2.6 ohms you measured. So i would bet that your pump motor is OK.

  5. #5
    Join Date
    Jan 2006
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    370

    Default

    Thanks Claude. I forgot about ohms law. Silly me. I deal with ohms law everyday. I feel like a tool now
    Felix

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