Problem with my fuel system
 

Hi!

I have a Audi A6 Quattro Avant 1998 with a 2.8L V6 (28X XXXkm). I have a problem with the fuelsystem(i think). It seems like it only takes fuel from one side of the tank. So i have to fuel up after about 400km. From what i have heard it uses vacuum to "pump" the fuel over to the side were the fuelpump is. Any ideas on how to fix this?