'91 XJ won't stay on - JeepForum.com

 
LinkBack Thread Tools
post #1 of 2 Old 08-12-2007, 02:09 PM Thread Starter
DKBlaze
Registered User
1991 XJ Cherokee 
 
Join Date: Feb 2005
Location: Denver, CO
Posts: 42
Xj '91 XJ won't stay on


Well I just installed a new fuel pump hoping that was the issue was told by a mechanic that if there wasn't a gush of gas coming from the rail when the key was in the on position then it was the fuel pump. Well it didn't gush, so I changed the fuel pump dropped $150 .
Well now a new battery later cause the other was so uncharged they just gave me a new one, it's doing when this issue first happenend, anybody can you PLEASE give me some clue of what to look for I am at wit's end


Colorado Jeep Club Member #45

And shepherds we shall be for Thee, my Lord, for Thee. Power hath descended forth from Thy hand that our feet may swiftly carry out Thy command. So we shall flow a river forth to Thee, and teeming with souls shall it ever be.
In Nomine Patris, et Fili, et Spiritius Sancti.
DKBlaze is offline  
Sponsored Links
Advertisement
 
post #2 of 2 Old 08-12-2007, 05:39 PM
Happy Joe
Registered User
1985 CJ7 
 
Join Date: Jun 2007
Location: Colorado
Posts: 2,365
You should check the fuel pressure at the rail. if it is not to spec (and the new pump is working (you should be able to hear it)) then check the fuel pressure regulator (if equipped). I am assuming that you have checked the filters, and that there is fuel in the tank) if the pump is running but will not hold pressure with the engine running and the regulator is good then you probably have a bad pump or a restriction in the line.
The fuel pressure should come up to spec and stay there with the engine running, it should bleed off very slowly (if at all) after the vehicle is turned off. If the pressure drops quickly after the engine is shut off then you probably have either a bad regulator or pump.
If the fuel pump is not working then check for voltage at the tank connection and back trace the wires to find the point that the circuit is broken. Note; the pump is normally controlled by a relay that will turn it on for a few seconds after the ignition is turned on then turn it back off if the engine is not started. I am not certain how this is determined by the computer on your vehicle (if the pressure comes up and its starts then the fuel pump is shut down by the computer then it likely that the computer is thinking that the engine is not running.)
If the pump does not run at all...many vehicles have crash sensors that will turn the fuel pump off until they are manually reset (fords are notorious for this ) I don't know if you vehicle is so equipped.
Hope it helps...
Enjoy!

...a well prepped, well driven, vehicle should do well in any terrain, including the highway.

Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.

Last edited by Happy Joe; 08-12-2007 at 05:52 PM.
Happy Joe is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Ouray/Telluride - where to stay? rballman Colorado Jeep Forum 22 09-08-2009 09:50 PM
Stay The Trail sticker CLNinja Colorado Jeep Forum 8 10-25-2007 10:56 PM
quick stay in Denver nquaint Colorado Jeep Forum 15 07-06-2007 07:52 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome