What causes the raw gas smell on the drivers side of a 1994 Ford explorer xlt 4x4?

Raw gas smell coming out from drivers side near gas tank, saw a rusted spot on the top gas line at rear near tank. Also off topic but the gas gauge says empty when according to specs it still has 4 to 6 gallons left.

Saw a rusted spot on the top gas line at rear near tank
You just answered your question. You have a leak.

when according to specs it still has 4 to 6 gallons left.
No such thing. The gauge may be bad, but the specs NEVER say there's any given amount of gas in the tank.

Gas causes a gas smell. You will need to check for leaks. Do not use a lighter or other open flame.

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