Nice 73! If the carb is leaking after shutdown, it's probably your carb float not floating enough to stop fuel flow, or something in the fill valve keeping it from closing all the way. Time to pull the carb to clean it up. Meanwhile, you can close the valve on the tank when you're done using the tractor to limit the leakage. I once had an entire tank of fuel leak out of one of my cubs while sitting in the shed.
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