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I agree you need to fix the leak. If it's draining out the bowl overnight, you've got to get that fixed. Does it drain the bowl or just the lines? If the bowl is dry, look at the bottom plug. If the float is the problem, gas will run out of the carb at shut off, until the petcock is turned off, and then will drain the line. In the morning, there will still be gas in the carb bowl, and the tractor should start anyway. Pull the air cleaner hose off just before you shut the tractor off, and see if gas runs out of the front of the carb a few minutes after shut-off. This is a float/needle type problem, and needs to be fixed (I had to take 3 runs at it to get mine to seal). If not, shut off the petcock and let it sit overnight. Then open the carb drain plug and see if you get gas out of the carb. If not, then there is a leak out of the plug or a crack in the bowl. When you go to start the tractor, they love to flood. Try this (assuming you have electric start). Get on the tractor. Set the throttle to 1/2. Do not pull the choke! Reach forward, open the petcock, then start cranking the engine. Once it starts spinning, pull the choke out then push it right back in. Mine will flood if the choke is on more than a second, and won't start (even warm) without just a touch. Good luck!
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