undreneath the car in front of the right rear wheel
Fuel pump relay Audi a4? what is the question? does it have one? answer:yes, where is it located: under steering wheel to right. need to remove panel. its the relay on the right.
A fuel pump pressure test could determine that.
Its in the trunk on the right under the rug.
Have a pro go at it, PITA to replace.
Yes it has, it`s in a fuel tank. (PD engine type)
My guess is that it is your fuel pump that you are hearing.
takes about an hour you access from under rear seat.. unit fitted to fuel tank...check FUEL PUMP RELAY first ....
The 2013 Audi A4 runs on premium unleaded (required).
The 2004 Audi A4 runs on premium unleaded (required).
The 2006 Audi A4 runs on premium unleaded (required).
The 2001 Audi A4 runs on premium unleaded (required).
The 2005 Audi A4 runs on premium unleaded (required).