Red Devil,

Another way to hook up the fuel system is to use a 3 line system. In this system you have one line with a clunk going to the carb, the second goes to the muffler for pressure, and the third one has a clunk and goes to a fuel dot for fueling. This method with the fuel dot will not have the leak potential the fuel valve will have. Also if you are having problems with muffler pressure when using a pitts muffler you probably need to use a pump. The cheap way is to crimp one of the muffler pipes but you will lose some power. With the pump you will retain all your power and maybe gain some.