On my Barracuda, the fuel pickup only had one line as your does that ran to the front of the car into the fuel pump. The fuel pump connected to the vapor separator which had one 5/16 line that ran up to the carb and one 1/4 line that ran to the back of the car and to the canister up in the trunk recess. In my setup, my gas tank has four lines that ran into a canister filter in the rear and one line ran up front to the vapor canister. I ripped all that and removed the vapor canister up front, removed the 1/4 return line and put a check valve on the open line that ran into the trunk recess. When I go to connect mine back up, I will buy a new vapor filter up front and I will run a new 1/4 line back to the trunk recess into that hose where I added a check valve.

I do not have part numbers but YearOne has replacements for all the parts I have mentioned and that is where I will get mine when I decide to run a new return.