[dentheman]

Fuel is not flowing fast enough to the carburetor bowl to keep it full while the engine is running, but it does fill back up when the engine is stopped. A carb cleaning is in order and a check of the float adjustment. However, you never did state you ran some carb cleaner through with the fuel or squirted some directly into the carb; that alone might be enough to fix it without carb disassembly.