Ok i have 3 fuel lines coming up through the frame in the engine compartment. I am wondering what do do with them. I know the big one (closest to the front of truck) is for the charcoal canister but i am not going to run one on the 350 so i plugged the line. One is the fuel supply so that one goes to the mech. pump but the other one is a fuel return line do i need that or can i just put a plug in. I am running a holley 600 4bbl carb if it matters.