Fuel Pump - Buzz or Humming Noise

9220audi01

20-89-T07
Oct 89


5000/T
M.Y. 1984-1988

100/200
M.Y. 1989


Electric Fuel Pump - Buzzing or Humming Noise From Rear Of Vehicle


Cause:
Noisy fuel pump or pressure damper


Service:
Before replacing fuel pump:

1) Check gasoline quality in vehicle for

A) High alcohol content

B) Volatility

2) Check gasoline in tank for any contamination caused by outside influences.

3) Check to see if fuel pump pressure damper operation is causing noise.

(Replace pressure damper if necessary)