KA24DET Fuel Pressure Regulator reading 100psi

[vinnyjdm]

EDIT: Fixed the issue. Clogged fuel return line. Thanks.


Purchased an ISIS adjustable fuel pressure regulator, installed it before I ever started my car.

The original one was reading 100psi (regardless of adjustment) (max psi for the gauge) and the car wouldn't idle. I had to keep feathering the gas to keep it on. I replaced it with a stock SR fuel pressure regulator and the car idled when i installed that.

Got a replacement ISIS fuel pressure regulator, it idles with it now, but the gauge is still reading 100psi fuel pressure (again no matter how I adjust it). It's also idling pretty low. Any idea of what could be going on?

-On my second fuel pressure regulator as stated above
-Brand new 300zx fuel filter
-Brand new walbro 250 fuel pump
-Deatschwerks 550cc injectors
-RS Enthalpy tune