After I fill my gas tank, gas will start to leak past my gas cap. I have replaced the gas cap with a new one from the dealer and still no luck. I placed a tissue in the gas filler compartment and it is wet, confirming that gas is coming from the cap. Is there any other reason why it would leak. Can my new gas cap be defective as well? When I take off the cap I do not hear any sounds. I would expect a hiss as pressure equalized. Can anyone offer any suggestion?

Thanks.

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Stan

1991 300E
1980 BMW 528i