Adjustable Fuel Pressure Regulator Help

Basic tech questions such as future setups, different turbo kits, car diagnosis, etc
Post Reply
Posts: 3
Joined: Tue Mar 09, 2021 4:51 pm

Adjustable Fuel Pressure Regulator Help

Post by S13Zeb »

I just installed an ISR fuel pressure regulator and its getting around 17 psi and when I try to adjust it nothing happens. The car is running fine and I even tried to adjust it with just the fuel pump on but nothing. I have a 255 isr fuel pump in the car that I got with the car and it was still in packaging so I don't think it's the pump. Any ideas on what it could be?
User avatar
Posts: 1126
Joined: Sun Aug 28, 2005 10:27 pm
Location: Detroit

Re: Adjustable Fuel Pressure Regulator Help

Post by p00t »

Is the gauge working okay? Check against another gauge somehow.

Are the lines hooked up in the right way? Make sure you are not flowing into the return port.

You might want to contact the manufacturer if you still have warranty and everything is okay above. If no warranty take the top half of the regulator off and make sure the shims, spring, piston, and seat all look okay. If the piston got assembled crooked somehow or the seat is damaged you will get a lot of bypass and low pressure.
Current Experiment: Project Twin-Charge 2022
Post Reply