I have a fuel gauge problem on my audi s3 2001. The gauge just seems to rise and fall from time to time resulting in a display of maybe 100 miles in the tank one min then next thing you know its 40 miles or even zero miles. I had a similar problem last year when engine management light came on and vag showed it to be a sensor, which i had replaced but there is no engine management light this time round. Maybe dirty or loose conections on tank but unable to locate? Thanks for any help.