It's pretty easy to see if that seal is the issue. The top black union just unscrews.
smoke test wouldn't hurt either but might not show a leak there unless it's under pressure which is what the tank will be and why you are smelling the gas.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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