What is causing the whining noise in the fuel-pump?

Discussion in 'General Motoring' started by nethere20, Sep 7, 2003.

  1. nethere20

    nethere20 Guest

    I have a 1997 Volvo whose fuel-pump is making a loud whining noise. My
    mechanic checked and found the fuel-pressure normal. Any chance that a
    10% Ethanol mix to the fuel may be causing the fuel-pump to be so
    noisy? Is it possible that the fuel-pump may quit?

    Thanks
     
    nethere20, Sep 7, 2003
    #1
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  2. nethere20

    Fred K Guest


    Mine did that on my 740... it whined for about 2 weeks... then it went out
    and left me on the roadway (only time in 150k miles..).. I'll bet yours
    craters in 100 to 600 miles from now.
    Not wishing you bad luck just been there before.
    I hope yours lasts for a million miles!!!!
    but thats not how I'm betting...
    ps my car ran perfect with the whining fuel pump right up until it would not
    move another foot.
     
    Fred K, Sep 8, 2003
    #2
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  3. nethere20

    Steve Rogers Guest

    I was in my local Volvo shop recently, and they have a scope-like tool
    that they can monitor a fuel pump with. They can tell, by liiking at the
    trace pattern if there is high draw, or low or high speed, or whatever
    ane where in the poles of the motor these patterbs appear, and they can
    tell you how likely it is that your pump will fail by looking at this
    pattern.

    I sat the tech check out the fuel pump on a Mercedes that was cutting
    out intermittantly. The tech showed me some patterns on the internet for
    this tool that showed what pumps with odd problems would show up like.
     
    Steve Rogers, Sep 8, 2003
    #3
  4. nethere20

    James Sweet Guest

    The pump in my 242 just died the other day, didn't make any funny noises or
    anything, though the current draw was apparently excessive as the connector
    to the relay was melted. The pump motor runs but it doesn't pump anything, I
    guess the impeller broke or something.
     
    James Sweet, Sep 8, 2003
    #4
  5. nethere20

    L.A. Guest

    on my 740s, when the one under the car whined, it meant the one in the gas
    tank was dead or dying.
     
    L.A., Sep 12, 2003
    #5
  6. nethere20

    AAlexander Guest

    If the pump under the floor is whining open the filler cap and listen to see
    if the in tank pump is operating, quite often this is the problem and it is
    loading the underfloor pump hence the whining.
     
    AAlexander, Sep 12, 2003
    #6
  7. nethere20

    Al Guest

    The in-tank pump is connected to the fuel pipe with a bellows hose
    that usually fails. When the tank is less than about 1/2 full the
    fuel gets foamy because of the split bellows. Ordinary fuel hose is a
    good replacement. Check the filter sock while you are in there. The
    in-tank pump is cheep. Fix it before you fail the expensive one.
     
    Al, Sep 14, 2003
    #7
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