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Strange buzzing sound

Discussion in 'Audi S4/A4/A4 Cab (B8 Chassis)' started by tinka, Mar 9, 2012.

  1. tinka
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    tinka Member

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    [Mar 9, 2012]
    Does the A4 2.7tdi, have an additional electric pump, or something in the fuel tank, I can hear a buzzing from the rear and thats all I can think off, it's fairly loud too, and it does not increase, when the engine is revved, getting on my bleeding nerves now, been in once, but they could'nt hear anything.
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