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This is how my EFI fuel system is run. Starting from the fuel pump: -08 AN hose to an Aeromotive fuel filter, then to the EFI throttle body. From the throttle body, an -08 return line comes off the other side of the rail to a fuel pressure regulator. Then -08 AN hose from the fuel pressure regulator to the return line inlet on the top of the tank. I could get away with using -06 AN hose on the pressure side and -06 AN hose on the return side of my fuel injection system up but, like I said earlier, was not sure if I was going to use supercharger in the future. -08 hose would defiantly feed as much power as I was willing to put in the truck.