fuel pressure over 100 PSI, help!!

[duenazn]

Ok guys i've searched here and on google to find the same issue but no response on the fix. I have a 240z with the sr20det blacktop, the car sat for over 4 years and I just got it running a couple weeks ago. I installed a wideband o2 to keep tabs on my AFr's and yea run way too rich, idle is not too bad at about 13.5 but once I give it a slight raise in rpm i'm looking at 12.1 to about 11ish. I cleaned my MAF sensor, cleaned the AICV, swapped my FPR for the NISMO and i'm still getting 100 psi, my gauge pegs out at max. I checked to see if my return line was clogged and its free. My last resort was to check my pump (walbro GSL392 255lph) and its pushing 100+psi right from the outlet. Funny cause on the pump housing it says 60 psi max. Is my fuel pump the culprit here? The engine is stock with the 370cc injectors the only upgrade is the walbro pump and Nismo fpr, I even ran the engine with no fuel regulator just a hose and still 100psi+. Was even thinking my return line was too small, seriously it's like an 1/8" stock 240z crap. I bypassed it to rule it out with a hose straight from the FPR to a gallon. I'm stumped guys, yes the pump as for the rest of the car sat for over 4 years. This is my first post on here and yes I searched with no luck.

[dccse3k]

are you sure your gauge is accurate? seems way too high.

[duenazn]

Yes I know, went to my buddy's place where he teaches and used the snap on fuel gauge there. Same reading. This is crazy..

[Skyline_BNR34]

Do you have the fuel pressure regulator on the fuel rail? You want to check it to the fuel rail because the pump will output more PSI but the regulator sends back the excess fuel to the tank and only allows the right amount of pressure in the fuel rail.

Do searchs for fuel pressure regulators and read up on them. But if your pump is pushing that out, you might want to check the amount of power going to the pump and make sure it's not getting too much power.

[duenazn]

yes the regulator is hooked up to the return side of the fuel rail. I was just running tests at every pressure point to see if there was a difference in pressure. It's reading 100 psi at the pump, at the rail and also 100 psi with the adjustment all the way turned to low. I just ordered a new fuel pump and hopefully thats it. The FPR is brand new and it's too much pressure to adjust it down.