It very well may be a stuck float valve. Tap gently on the float area of the carborator with the wooden handle of a hammer. That should unstick the float. or if that don't work, shut off the gas shut off and run engine until it runs the float bowl dry then repeat the tapping on the carburator at the float bowl area. Then turn gas back on and see if gas still spills out, if it does then you need to take carb apart, if it does not spill out it shoud be ok for a while. Run some "gum out" in your next tank of gas and you will have "fixed" it. Frank