JDM Fuel Rail and Aftermarket FPR Hookup questions
 

I installed and aftermarket FPR to my S5 JDM TurboII. I am not sure that I have it right though. THe way I have it hooked up is the following:

Fuel Filter to lower(Primary Rail) with stock PD on it
Lower rail to upper (secondary Rail)
Upper rail to aftermarket FPR
Aftermarket FPR to return line on tank

Is this the proper set-up? I have removed the stock FPR from the upper rail.

J-spec fuel rails would the opposite of what you described. On Japanese cars, the FPR is on the primary rail and the PD is on the secondary rail. Did the piece you removed have a vacuum port on it? I'd make sure you actually removed the stock FPR rather than the PD.

I have the stock FPR still installed on the primary (this in fact may be the primary rail from my s5 NA that I installed there because I messed the other one up trying to remove the stock one on the JDM one that came with the motor.) In any event, right now I guess I have the one WITHOUT a vacuum nipple on it on the primary rail with nothing on the secondary rail.