Some stuff:
Where did you get the idea for that filter? I bet it was not like that earlier
As Redfish eluded to THESE CARS DO NOT HAVE A RETURN as built. There are originally TWO tubes from front to rear of the car
One is the fuel supply to the inlet of the pump and is normally 5/16"
The other (as far as I know) is a 1/4" tube and IS THE VENT FOR THE TANK. It originally hooked into the "carbon canister" system, otherwise known as "evaporative emissions control."
DO YOU HAVE a factory service manual? If not, download one for free from MyMopar. No I don't work there. Some of them there came from the guys on here