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2000 Buick LeSabre smells like gas in the AM

Why does my car smell like gas in the morning?

Likely because it has a problem with it evaporative vapor capture system. Or the car is leaking gasoline.

Is there a yellow light glowing on the dash? You really should take it into a mechanic and tell them about the odor and when it occurs. Don’t park it in the garage until this is fixed, just to be safe.

its most likely a loose or split gas hose or a loose line connection if it has all steel lines it also may be a ruptures O ring on the fuel interjection .