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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.
Like Cab said above, only the hemi and 440/6paks got the vapor separator up front on the fuel pump and the return line to the sending unit. Now all aftermarket sending units have the return nipple. The return line was not very common on mopars. But it can be used and is the best way to run a return line on any motor and on most cars.
The vent separator in back(which has a different purpose than the one in front)was setup to join four vent hoses into one container where the fumes/liquid could separate/drain back into the tank. The four vent lines insures that the tank is vented even when it is full and the car is not parked level. The rear separator also insures that gas won't run out of your tank on the ground if it's parked full out of level.
The vent separator in the rear has a line that runs up front to the engine compartment up on top of the motor.(It's important to end on top of the motor because it's higher than the tank) Then gas and fumes will never spill out or be smelled in a closed garage.
There's nothing wrong or anything that can be improved from the factory venting. So I highly recommend to run the entire factory vent setup for your car model. This venting that I'm talking about has nothing to do with the fuel pump or the front mounted vapor separator.
The only thing I could see doing away with is the charcoal canister up front. So instead of terminating the vent line to it, you connect it to the breather on the valve cover just like they did it in 1971. My 71 is setup like that and it's always inside and I never smell gas.
I've replaced entire fuel systems here lately on 2 cars.
Last edited by Challenger 1; 06/04/14 07:05 PM.
