On the 600, I have two shut off clamps. One is to kill fuel from the main tank to the header tank, and the other one is to kill the fuel from the header tank to the carb. There is an Align 3 way filter between the header and the carb, and when I fuel it up, I close the header > Carb clamp and pump it full. If you see fuel coming out your exhaust, you added too much lmao.