from the vents? more than likely a fuel leak is it constant or only when the engine is running? if it's only when the engine is running you could have a leak on your fuel rail or the hard line going to it, pretty hard to guess but it shouldn't be hard to track down. If it's a pure gas smell like say takin a whiff from a gas can, then it's for sure a leak, if it's a "dilluted" gas smell might be an exaust leak.
I'd start first with SES codes even if the light isn't on, have it check just in case might have a stored code could point ya in the right direction, after that start at your injectors and work your way back looking for the leak, best advice i can give ya
Poison
99 Galant ES I4 167k mi and still going strong
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