Either the gasket/o-ring that seals the petcock where it screws into the tank is bad, or the petcock needs new seals/rebuilt (there are kits for this), or you could just replace the petcock. You need to get down there and see where the leak is actually happening.
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Either the gasket/o-ring that seals the petcock where it screws into the tank is bad, or the petcock needs new seals/rebuilt (there are kits for this), or you could just replace the petcock.
You need to get down there and see where the leak is actually happening.