
If you have a float sticking, it will cause all sorts of problems. Also, you will want to find the source of the errant fuel ASAP. If you smell gas, move the show outdoors to a well ventilated area. An easy way to know what you're dealing with up-front is to pull your oil fill cap, stick your nose up to the hole, and take a whiff. If that has happened, changing your oil in-doors could pose an explosion/fire hazard. It may stick for only a short time resulting in only a small amount of fuel loss, but any fuel in the crankcase is really, really bad.

Sometimes, if the line is pinched, plugged, or stopped up, over one night the contents of the entire fuel tank can find their way into both the airbox and the crankcase.

If a float sticks, the excess fuel should pour out of the overflow.

However, you may have had a carburetor's float get stuck and not even realize it, and now you might have a great deal of fuel mixed in with the oil in your crankcase. Oil will burn, mind you, but it takes a source of heat far greater than that of a simple cigarette or a lighter. Oil isn't all that flammable, but fuel that may have contaminated your oil IS.
