Yesterday, I dropped off my '84 GL at my mechanic's for its 500+ mile
oil change.  (The engine is still being broken in.)  I smelled gas
coming out of the rear when I stopped the van.  I mentioned it to Bob
and he said think nothing of it.  Last night, when I picked up the van,
Bob was showing me the 'notches' on the oil dipstick and and we noticed
his man shorted me a quart of oil.  As he was pouring in the oil, he too
smelled gas and immediately brought the van back into the garage.  Once
he crawled underneath, he found the fuel return had a plastic connector
on it and it was leaking- enough to wet everything down- even though it
was just a drip!  In any case, he tightened down the clamp another 1/3
of a turn and it stopped the leak and everything is fine now.

I couldn't smell the gas unless I was at the back of the van so I could
have been running down the road with the gas leak and the drops could
have hit the hot engine... Vanojet!