Has anybody experienced fueling problems after the car has been driven for over a half hour and it has less than a 1/4 tank of fuel? Pressure is building up in tank and it won't take any gas unless the cap has been off for 5 - 10 minutes.

If it is fueled after driving only 5 - 10 minutes, it takes fuel with no problem.

 

I have heard of all sorts of fuel fill problems with the Porsche line up since the 986. Most are easily corrected with misc repairs at the fuel neck or evap system.