sounds like the float may be stuck or the float valve/needle valve. One small piece of dirt will hold it open. Try tapping on the carb with the handle of a screwdriver to see if it will quit. If it doesnt stop, turn the gas off till it quits draining and try it again. If it doen't work after a few tries, you'll have to take it apart again and check the needle valve for a BIG piece of dirt in it.