Acquired a mac 3214 which had been improperly stored and the fuel lines were rotted. I replaced them and the primer bulb. The saw runs, and I can keep it running by gently squeezing the primer bulb, but it does not seem to pump fuel itself -- without squeezing the primer it stalls. The line on the right of the carb, opposite side from the fuel input on the left, seems as though it might be to receive a pulse to work a fuel pump. But where does the other end of that line connect, to receive a pulse from the engine? Thanks!