my 70 300 has been very gassy smelling for awhile. Thought it was from too much under hood heat so I would open hood after I parked it to let heat out. Not the problem. Found 2 rubber caps on gas tank that were rotten, replaced them, now no smell from under hood. still smell gas from under trunk, replaced gas cap, no change. checked vent tubes, then one that dumps right above rearend was plugged, fixed that. blew air though the other and it was clear. blew air into tank and they were clear...
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