You might want to buy a new gas cap. I think they are supposed to be vented and when they get old or bad they don't vent. That is why some cars fail Emissions tests. because of a bad gas cap. Just a thought.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.