Just bought this 1986 with 70k from short time 2nd owner(1 year). He said he always topped it off to the point of overfilling everytime he went on a monthly 300 mile round trip for past year. Smell seems to come from engine area and not back at fuel tanks. There are no wet or damp spots anywhere from tanks to carb. Cannisters are not cracked and all of the several feet of hoses appear good.
Any likely order for a parts performance check?
Thanks,
Dennis
It sounds like the charcoal canister is saturated, and letting excess vapors out of the bottom vent. This is a direct result of overtopping the gas tank, and the primary reason you should not do it. The canister will need to be replaced if the purge hoses and valve are working properly.