Fuel pressure at idle?

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Jul 16, 2011 | 02:17 PM

Synyster

Thread Starter

Seasoned Member

Joined: Jul 2011

Posts: 379

Likes: 2

From: New England

Year: 2000

Model: Cherokee

Engine: 4.0L

Fuel pressure at idle?

I was test driving a few Jeeps and noticed one at idle had 0(or slightly right above) fuel pressure. Is this normal? What does everyones Jeep have for fuel pressure at idle?

Jul 16, 2011 | 10:42 PM

Gee oh Dee

CF Veteran

Joined: Sep 2010

Posts: 21,168

Likes: 5

From: Milwaukee, WI

Year: 1987

Engine: Check

Quote:

Originally Posted by Synyster

What does everyones Jeep have for fuel pressure at idle?

39-42psi depending on year IIRC.

Jul 17, 2011 | 08:59 AM

blue_on_blackXJ

Senior Member

Joined: Dec 2010

Posts: 726

Likes: 0

From: Leadville Co

Year: 2000

Model: Grand Cherokee

Engine: 4.7

Pretty sure spec is just above 15 psi at idle. The one you drove very well could have a bad sensor too.

Sent from my Garminfone while fighting off ninjas

Jul 17, 2011 | 09:10 AM

SeriousOffroad

CF Veteran

Joined: Apr 2008

Posts: 13,952

Likes: 17

Model: Cherokee

Quote:

Originally Posted by blue_on_blackXJ

Pretty sure spec is just above 15 psi at idle. The one you drove very well could have a bad sensor too.

You're confusing the oil pressure with fuel pressure.

Aug 2, 2011 | 03:24 PM

casualties

Junior Member

Joined: Sep 2009

Posts: 94

Likes: 0

From: michigan

Year: 2000

Model: Cherokee

Engine: 4.slow

^^ agreed. fuel pressure would need to be read with a gauge on the schrader on the fuel rail. fuel pressure on lates is 49 +/- 5psi. Oil pressure should be between 20 and 50 depending on rpm.