That's odd you say that ... my TII JDM engine has it. But then, my TII JDM engine also had the fuel rails set up A-spec style (FPR on the secondary rail) ... but still does not have the full ACV solenoid setup like an A-spec does, so go figure...

 

The jspec fuel rails have the fpr on the primary rail? so fuel enters the secondary and the return comes off the primary? Damn i gotta check my setup if this is true.

 

Japanese engines change from Zenki to Kouki. the Zenki early model cars had the FPR on the primary rail and the Later models have it on the Secondary rail.

If running a aftermarket FPR we mix the two rails eliminating the stock regulator.



They all have the FPR solenoid.