I have three lines going into my tank. One from the muffler, a second from the carb and the third is run out to the back of the cowling so I can access it infront of the wing to refuel. I have a 4-40 screw plugging this line in flight. I also ran a tube from the crank case out to the rear of the cowl to drain out into the slip stream. I can post photos later tonight if needed