Originally Posted by CJ7ville
Is this a stuck float?
That would be my first guess, and I would start there.
That model engine should have a newer carb that should have an overflow line (and not the two holes) that connect to the canister, but it could have been changed. (but should still work fine.)
As well, there is a possibility that the fuel filter just before the carb has been changed. The filter should have one input (from the fuel pump) and two outlets, the large one going to the carb and the smaller is fuel return line (smaller diameter) that goes back to the fuel tank. The fuel filter should be positioned so that the return line is directly above the discharge line. While it is a complete shot inthe dark, that could contribute to the problem.