Audi fuel pump update - Richard Hall
I had a good look at the Audi this morning (see earlier thread). This model (1991 Coupe 20V) has a single fuel pump submerged in the tank. Access is by unbolting the protective plate on top of the tank (under the boot carpet) and removing the fuel gauge sender unit. On removing the pump I found the sump underneath was full of rubbish. Cleaned this out and the pump is now silent again. Thanks everyone for your advice.

The trouble is, I'll have to take it to bits again tomorrow, as while typing this I've just realised that I forgot to refit the retaining ring that holds the pump in place.....