Bought a project truck, 06 silverado with 4.8, came with fuel cell and factory pump. I have read about these truck's "returnless" fuel system. I plan on running fuel injection hose. But other than the main feed, and what I believe is the evap line, what is the other line? considering theres no return, right?

 

Charcoal canister?

 

the big one is part of the evap system and goes to the canister that used to be on the side of the tank. You can just cap it off as long as the tank is vented in some way.

 

yeah i was going to run a threaded vent in the port you see on the back of the cell. So the largest diameter tube? cap that? and the smaller one, below that in the pic, is the main fuel supply?

 

Correct, the small one in front is the feed line.

 

thank you. I also have the ls1 intake swap almost complete on my truck. not sure if theres a return port on the rail or not. I know theres a fuel pressure regulator. Will i just cap the return port if it has one?