Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Is the oil level over full and smell of gas?
Have you removed the float bowl on the carburetor and checked the float and needle valve t be sure float is working?
Float may not be closing the needle valve passage, did you remove the float and check to see if it may have fule in it, causing it to sink> See the carburetor link above I sent. Float has to control fuel flow to carb.
Did you remove the carburetor, or do this on the engine? You can hold the float up and it should stop the fuel from flowing into the bowl, if you test it in place.