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Thread: Fuel Pumps Loud after long drive

  1. #1
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    Fuel Pumps Loud after long drive

    Hi Guys,

    I have been experiencing a problem with my 500E, after a long drive and a hot day, if I turn the car off and on again, the fuel pumps sound very loud.

    Is this normal behavior?

    I have tried to capture it in the video here: https://www.youtube.com/watch?v=03RlXWDPShY

    Thanks,
    Matin

    Matin

    1992 500E - JAPAN SPEC

  2. #2
    .036 Hoonigan™
    E500E Boffin
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    Re: Fuel Pumps Loud after long drive

    The pumps should not be louder when hot vs cold. How old are the pumps?

    Dave M.
    1997 E420 (Bugeyes)
    1994 E420 (Blondie)
    1994 E500 (Q-ship)
    1992 500E (Mach 5)
    1987 300D (Sportline Stage 2)
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  3. #3
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    Re: Fuel Pumps Loud after long drive

    I changed them last week.

    theyre brand new!
    Matin

    1992 500E - JAPAN SPEC

  4. #4
    .036 Hoonigan™
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    Re: Fuel Pumps Loud after long drive

    Yikes. Are you certain they are Genuine Bosch and not counterfeits...?


  5. #5
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    Re: Fuel Pumps Loud after long drive

    yeah, thing is that my old pumps were making exactly the same noise, so I decided to change them, but the new ones are also making the same noise, so I'm not really sure what's up?

    I've tried two different LH modules and they both the same, not sure what else it could be?

    It sounds asif the fuel pumps are almost dying or something..
    Matin

    1992 500E - JAPAN SPEC

  6. #6
    .036 Hoonigan™
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    Re: Fuel Pumps Loud after long drive

    Total wild guessing... but maybe the inlet screen from the tank is restricted and the pumps are struggling to pull fuel? I assume the fuel pressure is normal and the car drives OK?

    The LH just triggers a relay to turn the pumps on or off, so if the pumps are running when they are supposed to, the LH wouldn't cause any other issues.


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