Any rust particles moving through the fuel system will cause the engine to flood. If you lift off the top of the carb, and find what looks like miniscule particles of red sand, then the rust is your culprit. The needle valve will not tolerate these pieces. Install an inline fuel filter before the carb, and even a second one before the pump. I have seen instances where the sediment from the tank will even case the seats in the fuel pump valves to remain open.
There is a course filter inside the fuel tank, but it is not enough to prevent this type failure.
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