I have an Audi A6 2.8 Avant 1998, U.K.
My problem is when the car is running, the fuel pressure in the tank gets so high you can hear air hissing out of the filler cap area. I can fill up with fuel as normal and apart from the fuel level indicator being a little erratic the car is running OK and has been with this problem for over a week.
Any thoughts? Fuel pressure regulator? Fuel Cap?