Hi guys, Ive had my audi (1998 2.5 TDi Quattro) for a mere 4 months now and after discovering a couple of minor problems with the car I now have a major problem which Im hoping someone has seen before. Last weekend my car suddenly stalled & since then Ive been unable to start it. I got it toad to my mates house since he knows quite a bit about cars so he could take a look. He initially thought the problem was with the fuel pump but on closer inspection he said its working fine but it seems the fuel is leaking back to the tank. Could there be a valve or device that is cracked causing a leak on the pressure side of the fuel line in the tank causing this circulation problem? If so is it a common audi fault? Im beginning to get worried that this is going to be expensive to fix since it looks like a garage will have to strip down the unit to workout where the problem is. Any advice would be much appreciated - I need to get back on the road!