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Flooding out can only be caused by a problem with the needle, seat and float. I need a little more info. Do you turn the gas off at the settling bowl when the tractor isn't in use? If you don't do this, then I think you don't have a flooding out problem. It would be a starving problem. Both are fuel problems but the cause and fix are different. Starving is most often caused by an obstruction in the tank, settling bowl, fuel line or carbureter. Loosen the fuel line at the carb. See if you get a continuous and steady flow. If you don't, the problem is the line, settling bowl or tank (or filter if it has one). If the flow is good, the problem is in the carb. The float could be stuck or the needle stuck in the seat. Or you could have obstructions in the carb. If you've been turning off the gas, it could be flooding. I've had this problem many times. There are only a few possible reasons. The most common one is that the needle and seat are worn out. A second one is that the float is adjusted improperly and cannot put the right pressure at the right angle on the needle to push it home. And one that's caught me a couple of times is that the seat is not sealed to the carb body. This can happen as a result of a scratch on the carb body or a bad gasket. These are a few things to check. The reason I concluded that your problem is starving is as follows. If the problem is flooding and you don't turn off the gas, the carbuteter would be full of gas in the air channel and the tractor would never ever start. Since it starts and runs, it must be starving. runs fine when the carb bowl is full but the gas isn't replenished as it is used. When the bowl is empty, the tractor dies. A carburator rebuild kit will give you a new needle and seat. But the rebuilder must make sure of the carb body and float settings and cleanliness through the system. Generally the kit will describe the float setting.
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