can anybody diagnose this problem? My A4 is leaking small amounts of diesel from the fuel filler cap. I replaced the cap with a genuine Audi cap but it has not solved the problem. The inside of the cap is always wet when I remove it (my previous cars were always dry) and there is a visible wet patch beneath the cap on the plastic surround by the drain hole. When I have fueled up this often spills out on the back wing, even when the tank is only half full!?
Is this something to do with venting of the fuel tank? I spoke to my normal Audi specialist (not dealer) who said he had never come accross it before.
I have done some searches but I cant see anyone with the same problem.
Any help appreciated.