a question. Do you do gasoline through the mouth of the carburetor? Because if so, you are beating the carburetor cuba but directly to the multiple. It has happened to me with cars that eh had stopped for time and it has always been the punch or float valve as you want to call it that it sticks with the seat of it a tartar occurs that can leave you crazy because it shrinks you the cycleres forms around and if you look at them through the light you see them well but you pass them through a caliber and come out a "tuber" of the tube. I hope my comment helps you some greetings.