Last week I noticed my 2171 leaking gas when I filled it up but figured it was pressure in the tank. Then, tonight as I fueled it up again I noticed it leaking again. It is coming from between tank and crank body on the clutch side. Without tearing it apart tonight (firewood tomorrow) can anyone suggest where to look? I am guessing it is the tank vent but I really don't have repair experience with this saw.