You could do it like I did in this photo. A short piece of diesel rated fuel hose makes the curve from the OEM return fitting on the top of the IP to the 3/8" hose barb/NPT elbow which screws into a 3/8" female NPT Tee with 1/4" hose barbs screwed into each side. A leaky OEM filter head annoyed me to the point of getting rid of it completely. In its place are now two filters, a Goldenrod waterblock fuel filter and the NAPA coolant filter. The waterblock is actually the second fuel filter, the first one being between the FSV and the Walbro Industrial E-Lift Pump on the frame rail.
You can either cut the steel fuel tube with the fitting on it that screws to the back of the IP and use it to clamp some diesel rated fuel hose on, or buy a new SAE/hose barb elbow to screw in there. Don't try NPT fittings- they'll just ****** up the threads and leak.
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