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chickenhouse
Enthusiast

Sep 15, 2009, 3:50 PM

Post #1 of 7 (1516 views)
Jeep Sign In

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?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 15, 2009, 4:13 PM

Post #2 of 7 (1512 views)
Re: Jeep Sign In

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)



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Sep 15, 2009, 4:14 PM)


chickenhouse
Enthusiast

Sep 15, 2009, 4:41 PM

Post #3 of 7 (1506 views)
Re: Jeep Sign In

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


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 15, 2009, 4:43 PM

Post #4 of 7 (1503 views)
Re: Jeep Sign In

OK, change the filter too.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



chickenhouse
Enthusiast

Sep 15, 2009, 4:53 PM

Post #5 of 7 (1497 views)
Re: Jeep Sign In

Was done today. Thanks.


chickenhouse
Enthusiast

Sep 16, 2009, 8:30 PM

Post #6 of 7 (1485 views)
Re: Jeep Sign In

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


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 17, 2009, 2:25 AM

Post #7 of 7 (1479 views)
Re: Jeep Sign In

I love it when a plan comes together.

Thanks for posting the results.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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