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I tested the pressure on the 4.0 and it is 31 psi with the vacuum line attached and 40 when it is disconnected, same regulator and same specs for both motors and the reg in my 4.0 test out good. I...

I started thinking like a plumber and decided to throttle down the return line right before the tank, I used some vise grips and pinched the line until the pressure at the rail was reduced to 31 psi...

I checked the spark and it's good, the motor will start when I plug off the return line from the regulator but the rail has 70 psi so it runs like crap but when I reconnect the return line to the...

Checked the filter and it is good, I am stumped.

Thanks for taking the time to try and help me, I would be awesome if you could give me a call and walk me through a few things.
Thanks Robert
503-860-8719

The regulator is out of my 4.0 ho, my 4.0 ran great with the regulator out of the 2.5 so I know that the regulator is good, I tested the pressure at the rail with the good regulator out of my 4.0 and...

My 94 Cherokee with the 2.5 4 banger has developed a fuel pressure proble, I tested the pressure at the fuel rail and it has no pressure then I removed the return line from the pressure regulator and...