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Most likely some of the bad gas is still in the system causing this. Run it until it runs better, if that doesn't help, drain ALL FUEL from it, including the lines, even dry them out before adding more fuel. You also might need to take out the spark plug and clean or replace it if it is fouled with it.
Good chance it is not getting fuel, or enough fuel. When the rig is cold, the choke is closed. As it warms up, the choke opens. If the metering jets inside the carb are dirty, they may not be letting enough fuel into the barrels. You could also have a vac leak that is masked by the choke until the engine warms up.
Not sure but maybe the fuel pump is very hot making the fuel boil. Maybe check to see if the tank is hot, ( touch it ) if it is the fuel pump or the fuel filter needs to be changed. The pump is very powerful and with the filter clogged up it'll work real hard to deliver the fuel at the correct pressure. This will make the fuel ump real hot hick may make it boil the cool fuel added. Does it do this if the tank has more fuel in it? A fuel pump that's getting this hot isn't a good thing and should be followed up on. The other thing that might be happening is the fuel inlet hose is picnced and the fuel is being reversed. But it seems like the lavel won't matter. Maybe the tank is'nt venting corectly and the tank is being sucked flat as it emplties and as it fills it goes back in shape. ( alot less likly.)
Sea Foam is a bad idea- its a good temporary fix but the cons outway the pro's-
When you first start your vehicle the pump has enough pressure to fire but it doesnt have enough ump to keep the proper pressure level and the engine dies- anything after 1995 has 1 to 2 pound variance of pressure anything less than that and the fuel pressure regulator fails to operate properly
check intake manifold air temp sensor and engine coolant sensor...one may be out of range but not enough to turn on dash light. tests and specs can be found in chiltons or haynes, test is done with digital multi-meter.