Okay, Let's all settle down with the legal matters and take note of what is important here. If you are running a two-line fuel system on a gas engine you want the vent line to make 1-2 loops on top of the fuel tank and then exit out the bottom of the fuse. The line with the clunk on it goes to the carb. It has a tee in it and a line running off of the 90 degree tube that is used to fill the tank. It goes to the fuel button. See below.