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I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.
It is in the float chamber of the carburetor.
A bad, stuck or dirty float needle inside the carburetor.
The needle and seat.
It very well could be, or a problem with the float. Remove the bowl off the carburetor, remove float, needle valve, and seat. Clean all parts good with carburetor cleaner. Float the float in some fuel to make sure it floats (when should not that any fuel inside of it). Put needle valve, seat, and float back on and open fuel valve a small amount, lift float up to see if it will shut fuel off, if it does reinstall bowl. If not you may have to replace the needle and seat.
It is usually above the float in the little bowl at the bottom of the carb.
Busted diaphragm in the fuel pump. Replace the fuel pump to solve this problem. Can also be a carburetor problem such as a leaking needle valve and seat or a pinhole in the carburetor float. This would require disassembly and rebuilding the carburetor.
More than likely, the fuel bowl float is stuck in the open position.
Have you checked to see if the float has a hole in it allowing fuel to weight it down? Possibly the needle valve is sticking and not the float. Could also be the float needs adjusting. You need to open the carburetor up and see what is going on.
Bend the tab that contacts with the "needle". But DON'T put pressure on the needle when you do so. Carburetor rebuild instructions that come with the carb rebuild kit will tell you how to adjust everything and give optimum float level settings.
The carburetor needs rebuilding including a new float, needle and seat, assuming it has a carburetor.
needle & seat maybe dirty , also check float level