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Shut off the gas at the tank. Disconnect the air cleaner line at the carb, and allow the extra gas to escape in safe manner so you don't have a fire. (Do you have a good extinguisher handy, just in case?) Turn the gas back on. If gas again runs out try tapping LIGHTLY on the carburetor body near the gas inlet fitting. If the gas flow out the carb air intake stops, you can re-attach the air cleaner pipe, and verify that you have spark at the plugs. Try to start the tractor. Do not try to start it with the pipe removed, because if there is a backfire, flaming gas will shoot out of the carb. You may have to remove the spark plugs and dry them with heat, or you may have to replace the spark plugs, if they have carbon deposits soaked with gas. If you can't get the gas to stop flowing out of the carb air inlet, you'll have to take the carb of and rebuild it, or at least check the float, and check the needle and set for a chunk of foreign material. While you're at it, remove the gas inlet fitting, and be sure the screen is intact, and clean it. On the other hand, there may be nothing wrong with the carb at all. If you choked the heck out of it trying to start it in the cold, or if you have ignition problems so it didn't start, the gas buildup may just be from choking it too much.
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