Fuel leak
3 Answers
Hopefully just a fuel line which would be cheap to fix. No way to know for sure until someone takes a look.
GM made sure the fuel lines would rust out by wrapping the fuel lines with a foil type wrap . This is a common problem any decent mechanic should be able to fix it in about 2 hours and 50 dollars in material Good Luck
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Or could just need a fuel filter. If its ancient it may have rusted out. Either way it should be an inexpensive fix.