24 I have an A2 VW and I hear buzzing from the rear of the car?
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This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
24 I have an A2 VW and I hear buzzing from the rear of the car?
A: These cars have two fuel pumps: The transfer pump which is mounted *inside*
the gas tank, and the regular pump which pumps the gas to the fuel
distributor.
Just before you start the car (key in "on" position) you should hear a
slight buzzing that MUST go away after 5 seconds. Whenever the buzzing
noise becomes increasingly more audible while driving, it may indicate that
one of the pumps is about to fail. Changing the fuel filter may help.
Bentley manual has a procedure to check the health of the pump, basically
by measuring the current being drawn.
Cleaning the fuel filter screen with the transfer pump also seems to help.
The transfer pump makes a 'wugga wugga wugga' noise when the key is turned
on, and then goes away.
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