I'm loking for fuel pump pressure on a 91 Jeep Cherokee w/6cyl (240?) This thing started running like doggie doo all of a sudden. Sent the owner after plugs, wires, fuel filter. No different, runs crappy. Idle varies like it's an I A C, cleaned throttle body with throttle body cleaner. No change. Takes a long time cranking befor it starts. I put a gauge on the fuel rail an it looks like it's an overwhelming 14 to 16 lbs pressure. Stays about there when it runs. I'm thinkin a fuel pump tomorrow. Agree?

Sounds like you have a fuel pressure problem.

Here's the spec



Fuel Pressure

Key On, engine running ------------------------------------------------------------------ 214 kPa (31 psi)
Regualtor vacuum hose disconnected ------------------------------------------------ 269-283 kPa (39-41 psi)




78 Corvette Pace Car For Sale-18k mi orig-Florida




(This post was edited by Hammer Time on Sep 15, 2009, 6:14 PM)

Thank you sir. Pretty much what we thought. Will install new tomorrow & you have a good evening.

OK, change the filter too.




78 Corvette Pace Car For Sale-18k mi orig-Florida

Was done today. Thanks.

He now has 35 psi and it "runs better than when I bought it!" Thank You.

I love it when a plan comes together.

Thanks for posting the results.




78 Corvette Pace Car For Sale-18k mi orig-Florida