'91 XJ won't stay on - JeepForum.com
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post #1 of 2 Old 08-12-2007, 03:09 PM Thread Starter
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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

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post #2 of 2 Old 08-12-2007, 06:39 PM
Happy Joe
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2006 TJ Wrangler 
Join Date: Jun 2007
Location: Colorado, USA
Posts: 2,398
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...

'06 TJ Rubicon; seemed like a good idea at the time; had many CJs...

Last edited by Happy Joe; 08-12-2007 at 06:52 PM.
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