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Fuel pump noise? 700 1988

posted by  Erwin on  Tue Jan 28 03:37 CST 2003
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last visit: Thu Oct 23 10:39 CST 2014
[RELATED]

I checked the FAQ and searched "Noisy fuel pump" which was helpful. What I suspect I'm hearing is the main fuel pump. A constant LOUD whirring / groaning that doesn't change with engine rpm. It's noticeable after driving about 20 minutes or so and can be heard better outside the car. I'm going to test current draw this weekend and try to isolate the noise.

This may be related but accellerating in 2nd or 3rd the car surges gently. At first I thought it was just drivetrain or that I wasn't shifting smoothly but now it's clear there's a surge. No black smoke, missing, stalling etc.

Any ideas?
--
Erwin in Memphis, '95 855t








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    Fuel pump noise? 700 1988

    posted by  someone claiming to be steve on  Tue Jan 28 03:54 CST 2003 [RELATED]

    Loud noise is a sign the pump is either overloaded (due to failure of the prepump) or failing. Try checking current draw.








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      Fuel pump noise? 700 1988

      posted by  subayai on  Tue Jan 28 13:15 CST 2003
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      My experience was the fuel pressure regulator on the fuel rail (just before the injectors). I replace the main pump (under the drivers seat) prematurely due to a similiar noise, only to find out later that it was the regulator (which is a whole lot less money). Check it out before you drop the money on a new pump.








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        Thanks 700 1988

        posted by  Erwin on  Sun Feb 2 06:42 CST 2003
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        last visit: Thu Oct 23 10:39 CST 2014
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        That might be what it is. I'm experiencing some surging also and other posts suggest the regualtor for this as well.
        --
        Erwin in Memphis, '95 855t







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