Hello dear Audi friends, I have a 92 ́ Coupé quattro 2.3 5-cylinder. Unfortunately, I have had an extremely annoying noise in the trunk for about a year. I suspect that there is another petrol pump in the tank (or at least in the immediate vicinity). The noise gets louder with a full tank quieter and with an increasingly empty tank. Is there another fuel pump at the bottom of the body? A search in the rear area has unfortunately not been successful. The sound switches on and off as desired, takes a little longer… Extremely sporadic. I hope you can help me. Greetings, Kevin.