The part in bold confuses me. As I stated, you only need a 1/4-in. NPT to -6 an male fitting on the fuel rail. Use a braided line with two -6 an female ends, one on each end, or use a pushlock system with -6 an female ends. The FPR will have a -6 ORB to -6 an male adapter. That's it.
The bottom of the FPR is the return. You plug the unused side (again assuming an Aeromotive A1000-6).
You can see the plug on the side of the FPR, the end of the Pallnet fuel rail, the 1/4-in. NPT to -6 fitting and the braided hose. You can also see, if you look closely, the other end of the hose connecting to the FPR.