Theres lots of places that gas fumes can escape. Check the fuel return line that comes from the fuel pressure regulator. Its just clamped on and can come loose. Basically, check all your connections. Fuel filter fittings work loose as well.
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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t