I don't think the possibility of flooding through the tee ever exists. In a normal engine I'm sure it's impossible however, as I stated, it is printed in the instructions for many fuel dots so new guys reading that and then coming here may get confused with the conflicting information. Personally, I always shut my throttle after running my fuel out so it's normally shut the next time I fill the tank. The simple fact of the matter is that the gas can run freely into the tank and not into the carb so, NO, you can't flood the engine that way.