The machine is having a fuel delivery issue The purge/primer bulb PULLS fuel from the fuel tank, thru the carb and then to itself it pull any air/old fuel in the carb...and the PUSHES this mixture back to the fuel tank. There are check valves in carbs that have the bulb on them..Deteriorated fuel lines clog a screen in the carb and the ethanol in the gas works to deteriorate the fuel pump and metering diaghram in these carbs...You have to start at the tank with the fuel filter and go from there.
I'd say from the running symptons that a diaghram kit is needed for the carb...they are cheap and easily installed.
If you see gas in the primer bulb it is pulling in gas to the bulb. If not check for cracks in the bulb assembly and check to see if the fuel lines are not off their fittings and not cracked.
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