Jon, I just checked out that PDF link, does your FPR have two inlet ports like that?
Anyway, I see what they have done. There is a T-fitting in both the input and output lines. T-fittings should be avoided(flow), but the two returns at the FPR is okay. I like that they made a separate inlet to each rail, but the T-fitting to split the main line is a poor flow choice.
I have just found a $25 Y-fitting in that Jeg's catalog. I want to use those for trans lines, but that fuel system is what they are ideal for. I would buy on of those Y-fittings and plumb two short lines to the fuel rails. Then plumb the two return lines to the FPR.
Where have you got the FPR, is it near the two OEM lines? I'm interested because I will need to do the same thing with mine. Have you changed the return line to 3/8" line? I'm hoping to do both OEM lines and make more room for headers. Regards,