Where does the extra vent line go? on 2003 Dodge Ram 3500

I am installing the upgrade to place the fuel pump inside the fuel tank (as opposed to mounted on motor) and have found an extra vent line on the new part. Where does it go?

Asked by for the 2003 Dodge Ram 3500
ones an air valve the others a return line. phone VIN# in to dealership and ask for a schematic diagram. item is a recall so info should be forth coming. it should have come with the part.