Originally Posted by
hhrfreek
John if you had to guess, how far down did you push the top of the regulator in? What is spec for LNF fuel pressure low side stock?
Please LMK if this is correct. I checked the fuel pressure at service port key on ENG off 59-60psi then I hear a slight tick after about 2 seconds and it drops and holds at 57-58(not sure what number to reference). Something to do with the HPFP? Tick is audible from under the hood pressure drops slightly. Pulled out the pump and got the regulator off. Pulled all the o rings off the regulator and put it into a 22mm socket. Then I used a 12mm socket on top and gave it a couple cracks and pushed the top down about 1.5-2mm. Thinking this would increase my pressure about 10% and it did, but I am still only at 65psi then like before a click and pressure drops to 62-63. Regulator could have been low from the beginning and that could be why my car had a little trouble with e47 when cool without the 5th inj. I haven't driven the car yet because I did that last night so unsure on how this will affect the tune. Does not take long. 90min total start to finish. PITA is the lock ring...must be a proper tool for that which I don't have. I will put a little more pressure on the spring if recommended. Took some pictures, but can't upload them till I am home. If I do it again I'll just put it in the vice.