Carb keeps weeping gasoline. I can smell it in my garage and can see it in the carb throat. Had the float valve reseated and put in a new float needle valve, put in a new carb body gasket, tried to seal around the needle valve body (carburator nozzle) with clear fingernail polish where it mates with the carb body all to no avail. Can anybody help me analyze and solve this gas leak problem? I have also put in a fuel filter, fuel shutoff valve and a section of new fuel line, cleaned the carb and readjusted to high speed and idle jets. It runs for about twenty minutes, then starts sputtering and proceeds to die, I think because the float valve is not working properly. How can I check the float level performance without removing the carb?