hi - im not sure about the static?? thing
but if there is a clear vent tube in the top of tank ,and the floats are wore out -or need adjusted ,the gravity will put pressure through the carb and spill fuel into the cylinder i know this from fixing that kind of problem
-and is worse if the tank is under pressure- like the old kawasaki street bikes- they had no off on the petcock-remeber those ?
thats why i said tapp on it to see if stops sometime they stick,or oil /dirt- cloggs up in it.
and replace as needed ,you shoul'nt need to turn the valve off - that is the job of the needle and seat-(to shut the fuel off)-but doesnt hurt to shut it off when done riding :cool: -
hope this clears it up -take care