First off I'm running a walbro 255lph HP pump, and 750cc RC Injectors.
NOTE: Fuel pressure gauge is rading from fuel filter.

I was getting really high Idle fuel pressure (like 58psi), so I just bought a Synapse FPR. MY first question is directed mostly to Synapse. The FPR comes with 3 fuel return fittings and it says use the 2.5mm fitting. Since they arent labeled which one is the correct one?

Second, I started off with the second largest one and my idle fuel pressure dropped to about 40psi. I tried adjusting this with the allen adjustment screw on top of the FPR and the fuel pressure would not budge either way.
Then I put in the largest fuel return fitting. Fuel pressure dropped to 30psi. Again, the adjustment screw would not raise or lower the fuel pressure.

Questions.
1.Will the gauge reading at the fuel filter alter my readings, reading from the fuel rail better?
2.Do I really need to connect a boost only line to the top port, or is that only for the FMU?
3. WTF why cant I adjust the fuel pressure???




Modified by Shmaa at 1:15 AM 7/8/2006

 

uncap ur gas tank to air out...and redo it...should read 45 psi when ur at idle....

 

I just had some luck. With the largest return fittin in, I cranked the adjusting bolt pretty far and it went from 30 to ~38 which was cool, but I cranked the car on a few min later and It was sitting at 65psi lossened it up a little and it went back to ~40.