I guess I would do what ever suit you. Its your truck. But since you asked, if the sender is 3/8, I would run it all the way to the carb. Aluminum line im not real fond of. The are a great heat conductor if routed close to exhaust mans etc and fuel dont like heat. Especially in Texas or any place for that matter where it tends to get abit toasty. I would use steel if possible. Rubber fuel specific hose is an option also and real easy to route.