Jeep Cherokee Forum

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech
Register Forgot Password?
Register Photos FAQ Members List Social Groups Search Today's Posts Mark Forums Read GarageVendor DirectoryvBLive
Search

Welcome to Cherokee Forum!
Welcome to Cherokee Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread Display Modes
Old 02-07-2009, 01:50 PM   #1
Newbie
 
Join Date: Feb 2009
Posts: 8

View BillProctor's Photo Album My Photos
Cherokee
Default 1992 4.0L jeep cherokee fuel pump problem

My son bought this jeep last week not running and now he trying to get it running. The fuel pump will not come on. We have swapped the pump from his other jeep(same model/year) that is running with no luck. The pump is not coming on. We have gone thru all of the relays and fuses under the hood. My fords have a cutoff switch but jeeps apparently only have the relays. Is this true. All of the wiring looks good. Can I get a few Ideals on what might be the problem with it. All suggestions are greatly appreciated.
BillProctor is offline   Reply With Quote
Old 02-07-2009, 02:17 PM   #2
::CF Administrator::
 
okcjeeper's Avatar
 
Join Date: May 2008
Location: Okc area
Posts: 9,926

View okcjeeper's Photo Album My Photos
1991 Cherokee
Default

Did you get a volt meter out and test the sender and the connectors an such where there pump/sender plugs in?
okcjeeper is offline   Reply With Quote
Old 02-09-2009, 04:33 PM   #3
Newbie
 
Join Date: Feb 2009
Posts: 8

View BillProctor's Photo Album My Photos
Cherokee
Default

yes we did we check all the relays and fuses then even switch fuelpumps with another one and still nothingthe oringial pump works wtih the other jeep and the new one does not work with this 92 jeep
BillProctor is offline   Reply With Quote
Old 02-09-2009, 04:59 PM   #4
::CF Administrator::
 
okcjeeper's Avatar
 
Join Date: May 2008
Location: Okc area
Posts: 9,926

View okcjeeper's Photo Album My Photos
1991 Cherokee
Default

Did you check the fuel pump sending unit plug itself? or did you switch those as well? If so then somewhere between the plug that plugs into the sending unit to where ever is shorted out or something.
okcjeeper is offline   Reply With Quote
Old 02-09-2009, 05:02 PM   #5
Senior Member
 
jpdocdave's Avatar
 
Join Date: Aug 2008
Location: tan house white shutters key's under the flower pot
Posts: 969

View jpdocdave's Photo Album My Photos
1996 Cherokee
Default

have you checked spark and injector pulse. if you haven't, and find you also lost spark and pulse you probably have a bad crank sensor
__________________
96 xj sport 2" bb 31's
90 mj 4.0 4x4 d44
87 yj frame off (crazy red head)
90 yj soa

pics of project "crazy redhead" http://s293.photobucket.com/albums/m...0build%20pics/
jpdocdave is offline   Reply With Quote
Old 02-09-2009, 05:02 PM   #6
::CF Administrator::
 
okcjeeper's Avatar
 
Join Date: May 2008
Location: Okc area
Posts: 9,926

View okcjeeper's Photo Album My Photos
1991 Cherokee
Default

Quote:
Originally Posted by jpdocdave View Post
have you checked spark and injector pulse. if you haven't, and find you also lost spark and pulse you probably have a bad crank sensor
Good call didn't even think about that.
okcjeeper is offline   Reply With Quote
Old 02-10-2009, 09:26 AM   #7
Newbie
 
Join Date: Feb 2009
Posts: 8

View BillProctor's Photo Album My Photos
Cherokee
Default

i'll try it let ya'll know later thanks
BillProctor is offline   Reply With Quote
Old 02-10-2009, 09:34 AM   #8
CF Veteran

 
BuckB91XJ's Avatar
 
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,970

View BuckB91XJ's Photo Album My Photos
1987 Cherokee
Default

Are you even hearing the pump prime when to switch the ignition to on (before starting)??? That is a buzzing sound that comes form the rear. You should be able to hear it inside the cab. If you aren't, you definitely have no power going to the pump itslef. If you have checked all the plugs and relays, then you do have a broken or shorted wire somewhere. Unfortuantely when talking fuel pump that could be anywhere from the nose to the tail.
__________________
Brian "Buck" Buchanan, U.S. Navy Chief Petty Officer (RETIRED) - 87 XJ Laredo - 8.5" Rusty's Offroad/Rough Country lift, D30 trussed up and D44 high clearance shock mounts, 4.56's, Aussies and Disc Brakes front and rear, JCR Offroad Belly Skid Plate and Stage 2 Rock Sliders, Off Road Fab Winch Bumper and Quarter panel Guards, Liberal Front Wheel Well trimming and Rear Wheel Well Cut N Fold, 35" Goodyear MTR with Kevlars, Cobra CB and AW4 First Gear Lock Crawl switch, SYE, Stock XJ driveshafts front and rear and Milemarker SEC8000 Winch.

91 XJ Sport (Old Gray Jeep) - Layed to Rest (04-01-13)
87 XJ Laredo (Ole Red) - (My Jeep)
87 XJ Base (The Boys Jeep)
96 XJ Country (The Daughters Jeep)
08 Dodge Charger R/T (The Wifes Ride)
04 Silverado 2500HD Duramax/Allison (tow rig)
BuckB91XJ is offline   Reply With Quote
Old 02-10-2009, 09:54 AM   #9
Newbie
 
bigwheeler's Avatar
 
Join Date: Feb 2009
Posts: 18

View bigwheeler's Photo Album My Photos
91 Cherokee
Default

im having the same problem but ive been dealing wit it for the past 2 years and finally i just did something bout. i changed the fuel filter because it was so plugged that it wasnt allowing the fuel to get to the engine i found this out by putting a pressure gage on the engine and it should have at least 45 lbs going to it. so try changing the fuel filter. now it runs like a dream.
bigwheeler is offline   Reply With Quote
Old 02-10-2009, 10:00 AM   #10
::CF Administrator::
 
okcjeeper's Avatar
 
Join Date: May 2008
Location: Okc area
Posts: 9,926

View okcjeeper's Photo Album My Photos
1991 Cherokee
Default

Quote:
Originally Posted by bigwheeler View Post
im having the same problem but ive been dealing wit it for the past 2 years and finally i just did something bout. i changed the fuel filter because it was so plugged that it wasnt allowing the fuel to get to the engine i found this out by putting a pressure gage on the engine and it should have at least 45 lbs going to it. so try changing the fuel filter. now it runs like a dream.
Plugged fuel filter can cause that but I think his issue is he's not even hearing the fuel pump attempt to prime. It should still come on and attempt to prime even with a plugged fuel filter. If ya don't hear the buzz when you turn the key to on position the pump is not coming on at all.
okcjeeper is offline   Reply With Quote
Old 02-10-2009, 12:02 PM   #11
Member
 
Join Date: Jan 2009
Location: ohio
Posts: 248

View gabe's Photo Album My Photos
1992 Cherokee
Default

I also have a 92 ,and had the same problem to the tee.check and see if you have spark,if you dont then it is probably the same problem i had.which is the computer next to the air box on the drivers side fender is going bad.beleive it or not but i was told to take mine out(which only takes about 5 minutes)bring it inside get it nice and toasty warm (i put mine on a heater vent for about 15 minutes)put it back in right away and see if it fires.and mine fired right up.so i got one at a junk yard for 30.00 bucks,and have been fine since.my old one will work in warm whether but not in the cold. Hope that helps
gabe is offline   Reply With Quote
Old 02-11-2009, 07:37 AM   #12
Newbie
 
bigwheeler's Avatar
 
Join Date: Feb 2009
Posts: 18

View bigwheeler's Photo Album My Photos
91 Cherokee
Default

or it could be that he does not have a good ground running to the pump or the relay box
bigwheeler is offline   Reply With Quote
Old 02-11-2009, 09:22 AM   #13
Newbie
 
Join Date: Feb 2009
Posts: 8

View BillProctor's Photo Album My Photos
Cherokee
Default

yea i switch out the crank plug and still the fuel pump does not work looks like i have a few problems. next im going to mess with the computers

Last edited by BillProctor; 02-11-2009 at 09:25 AM.
BillProctor is offline   Reply With Quote
Old 02-16-2009, 03:29 PM   #14
Newbie
 
Join Date: Feb 2009
Posts: 8

View BillProctor's Photo Album My Photos
Cherokee
Default

ok guys computer was the problem fuel pump now works. i have fuel , fire , compression but it still will not start . we even poured alittle gas down the thottlebody and still not even tries

Last edited by BillProctor; 02-16-2009 at 03:37 PM.
BillProctor is offline   Reply With Quote
Old 02-16-2009, 05:56 PM   #15
CF Veteran

 
BuckB91XJ's Avatar
 
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,970

View BuckB91XJ's Photo Album My Photos
1987 Cherokee
Default

You may have fuel and spark but, you either don't have enough fuel pressure or your spark is out of time. There is no magic to this. If it's all there and in the correct amount and firing sequence it should start right up.
Check your fuel pressure at the fuel rail test port with a pressure gauge. Turn the key to on and you should have 30 PSI or the pump is bad. If you have 30 PSI then, unplug the vacuum line to the fuel pressure regulator. The gauge should now read 38-39 PSI or your fuel pressure regulator is bad. Check out the Cam Position Sensor inside the distributor under the rotor plate. This gives you your ignition timing function. If it's bad you can have spark all day but, the rig won't run.
__________________
Brian "Buck" Buchanan, U.S. Navy Chief Petty Officer (RETIRED) - 87 XJ Laredo - 8.5" Rusty's Offroad/Rough Country lift, D30 trussed up and D44 high clearance shock mounts, 4.56's, Aussies and Disc Brakes front and rear, JCR Offroad Belly Skid Plate and Stage 2 Rock Sliders, Off Road Fab Winch Bumper and Quarter panel Guards, Liberal Front Wheel Well trimming and Rear Wheel Well Cut N Fold, 35" Goodyear MTR with Kevlars, Cobra CB and AW4 First Gear Lock Crawl switch, SYE, Stock XJ driveshafts front and rear and Milemarker SEC8000 Winch.

91 XJ Sport (Old Gray Jeep) - Layed to Rest (04-01-13)
87 XJ Laredo (Ole Red) - (My Jeep)
87 XJ Base (The Boys Jeep)
96 XJ Country (The Daughters Jeep)
08 Dodge Charger R/T (The Wifes Ride)
04 Silverado 2500HD Duramax/Allison (tow rig)
BuckB91XJ is offline   Reply With Quote
Old 02-16-2009, 05:56 PM
 
 
 
submit to reddit
Reply
Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
98 jeep cherokee fuel gauge problem brianmb78 OEM Cherokee Tech 4 07-19-2012 10:13 PM
1992 Jeep cherokee 4.0L BillProctor Grand Cherokee Tech 4 02-07-2009 12:55 PM
1992 Jeep Cherokee AC pump problem heidirol OEM Cherokee Tech 1 12-21-2008 08:37 PM
1992 jeep cherokee jstewart1960 OEM Cherokee Tech 11 10-30-2008 07:33 PM
Charging problem 1992 Cherokee 4Ltre bostruck OEM Cherokee Tech 4 07-13-2008 03:51 PM


All times are GMT -5. The time now is 11:47 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.5.2
This site is in no way affiliated with Jeep or Chrysler.

Emails Backup