One other point to look at. I have had cars where I could smell gas but never did find he culprit until its nasty head showed itself. That being the mech fuel pump. If the diaphram decides to crack it can let enough fuel into the pump housing but not enough to really show the leak, then once the diaphram lets go it could go out the pumps vent or worse case be dumping fuel straight into your crankcase. Just something else to look at.
Jeff
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