Well here is my setup: Fuel pickup line(to carb) has a T on its way to the carb and a small (2 inches) piece of tubing on the leg of the T so to speak and a clamp to close it for normal engine runing. I use this one for emptying the tank since it goes to the clunk. And the third line I run out of the cowling and this one I use to fill up till fuel comes out of the muffler and close it with a self tapping screw. Hope this helps