Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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When you take the screw out of the bowl you said there is no fuel coming out. Have you made certain that the fuel valve is turned on? There is fuel in the tank? I am in no way trying to be smart about my reply but we have to cover all the possible causes and these are the two easiest and could save a lot of other troubleshooting if either of these are not checked.
Once you are certain that these are not a problem then lets remove the fuel bowl from the bottom of the carburetor if you haven't done so already. Then we want to move the float up and down to make certain that it is moving freely and that the float valve is working properly as well. If everything is working properly and you pull the float down you should have fuel flowing out through the float valve, if not then we need to look for an obstruction in the fuel system, either fuel line restricted, fuel shut off valve clogged, inlet of carburetor stopped up.
Yes, the float bowl is actually behind the air cleaner assembly. You should find two bolts or screws in the bowl, one in the bottom center and the other offset to one side, the bottom center one will actually remove the bowl, the offset one is to drain the fuel from the bowl. I would remove the bowl and make certain that you have fuel coming into the carburetor when the float is down or open.