When I filled up my tank, I stopped at the first click. After I park it I noticed that gas is coming from around the cap. I replaced the cap with one from the MB dealer. I still have the same problem. Today I drove the car for 30 miles, just to use some of the gas. But when I went to take the cap off, gas started flowing out of the fill spout. Can someone tell me why there is much pressure in the tank that it would cause the gas to overflow, even after I drove it for 30 miles. I know that I did not overfill the tank . Your advice is appreciated. Thank you.

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Stan

1991 300E
1980 BMW 528i