2002 Audi A6 3.0 engine. Had a CEL light a few weeks ago. Took it in to dealership and they replaced evap unit and a few hoses.Car recently has developed a small gasoline leak in rear. I overfilled tank a few months ago. Local station looked at it and could find nothing wrong. They said by overfilling I had saturated something (???) . Anyway...lesson learned. I now run the car between 1/4 and 1/2 tank. However yesterday filled tank to 3/4, and once again gasoline leak on garage floor (Nice smell). Drove to work and CEL comes on again. Haven't had the shop pull the codes yet, but at this point Im searching for answers. Believe me Audi's are nice rides, but my next CEL light is pushing me into an Acura. Thanks.