NEW PLUG! The float needle may be free, but you need to be sure that it is actually shutting off the fuel. The seat and needle tip could be damaged and/or a a bit of trash could be there as well.
"The rifle itself has no moral stature, since it has no will of its own. Naturally, it may be used by evil men for evil purposes, but there are more good men than evil, and while the latter cannot be persuaded to the path of righteousness by propaganda, they can certainly be corrected by good men with rifles."J. Cooper