fuel pump? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-08-2010, 09:50 PM   #1
Newb
 
Join Date: Mar 2010
Location: Nashville, TN
Posts: 11
Images: 1
fuel pump?

What is the spec PSI for a 98 6cyl wrangler at the fuel rail? I just moved and am having a problem locating my manual.
My problem is my jeep sputters and wants to stall if I do anything but drive it around slowly. I checked the pressure. It was 44PSI. A guy at autozone said it should be 95-115. I also have 2 codes. I had them check the codes and it came up fuel pump and oxygen sensor.

98 Sahara is offline   Quote Quick Reply
Old 03-08-2010, 10:18 PM   #2
IITYWTMWYBMAB

WF Supporting Member
::WF Administrator::
 
4Jeepn's Avatar
 
Join Date: Apr 2005
Location: Florence, KY
Posts: 9,796
Images: 5
I want to say 100 is more like it. Also, just to rule it out, check the connections for the fuel pump just above the rear diff near the tank.. some times the wires can get loose and cause issues... I think the pump is the green or black or green with black wire...been a while.

__________________
79.96.85.00.01.97.00.97.93.97.95.94
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ
4Jeepn is offline   Quote Quick Reply
Old 03-08-2010, 11:22 PM   #3
Jeeper
 
Join Date: Sep 2009
Posts: 198
It should be around 43 at idle.
Injectors are rated by the amount of fuel they deliver at a given pressure, either 39 or 49 psi for 4.0Ls depending on year.
__________________
98 TJ,4.0, 5 SPD, 4' SPRINGS,RC 2.2, SYE W/ TW DRIVE SHAFT, JKS ARMS,JKS ADJ. TRACK BARS, CURRIE ANTIROCK, ACOS ADJ, REAR D44 W/ DISC BRAKES, 62 MM THROTTLE BODY, POISON SPYDER SLIDERS, LED TAIL LIGHTS, K&N INTAKE, THORLEY HEADERS, FLOWMASTER EXH,H4 CONVERSION, 35" BFG AT
SPDNJOE is offline   Quote Quick Reply
Old 03-09-2010, 07:17 AM   #4
Newb
 
Join Date: Mar 2010
Location: Nashville, TN
Posts: 11
Images: 1
So I checked the pressure at 44psi so it must not be the fuel pump. Any ideas on what the problem might be? It's really bogs down if I give it any gas. Starts with no problem. It has sat a couple weeks, but that's been the norm for it for the last couple years. Check engine light is on and gives fuel and oxygen sensor codes.
98 Sahara is offline   Quote Quick Reply
Old 03-09-2010, 08:03 AM   #5
Deaky

WF Supporting Member
 
Fweaky's Avatar
 
Join Date: Aug 2009
Location: Central Virginia
Posts: 2,202
Images: 18
Might be the throttle position sensor if it runs okay until you hit the gas.

__________________
Nothing is foolproof to a sufficiently talented fool.
Fweaky is offline   Quote Quick Reply
Old 03-09-2010, 09:03 AM   #6
Newb
 
Join Date: Mar 2010
Location: Nashville, TN
Posts: 11
Images: 1
Unfortunately since I originally listened to the Autozone guy before deciding to research a little more, I have already dropped the fuel tank. So to test anything else I'd have to put it back. Not to say that would be terrible, but with twins, time to work on my vehicles is scarce. Anyway, my question is, even though I checked 44psi at the fuel rail during idle, is it still possible the pump may be not functioning properly under acceleration? Should I just put in the new pump or do you think that is probably not the problem. It would be a $220 risk. Another note. I have thought for some time the engine felt somewhat weak and it "chugs" under heavy acceleration, or when I pull about 1000 LBS.
98 Sahara is offline   Quote Quick Reply
Old 03-09-2010, 09:57 AM   #7
IITYWTMWYBMAB

WF Supporting Member
::WF Administrator::
 
4Jeepn's Avatar
 
Join Date: Apr 2005
Location: Florence, KY
Posts: 9,796
Images: 5
Is it possible to have the fuel pump tested? also try rockauto.com should be under 220 on the pump there.
__________________
79.96.85.00.01.97.00.97.93.97.95.94
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ
4Jeepn is offline   Quote Quick Reply
Old 03-09-2010, 11:58 AM   #8
Newb
 
Join Date: Mar 2010
Location: Nashville, TN
Posts: 11
Images: 1
I checked it at the fuel rail at 44 PSI.

98 Sahara is offline   Quote Quick Reply
Reply

Tags
6 cyl , fuel pump

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

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.



Thread Tools

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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel pump initially won't activate. '95 YJ Rray1 YJ Tech Forum 28 10-04-2012 09:35 AM
92 YJ 2.5 Won't start, no power to the fuel pump eyeChrs YJ Tech Forum 15 02-14-2012 04:46 PM
97 wrangler no start got spark no power to fuel pump 97rangler TJ General Discussion Forum 12 05-11-2011 10:41 PM
2000 jeep wrangler fuel pump replacement madmilitia TJ Tech Forum 16 07-08-2010 03:40 PM
No Injector Pulse, 89 Wrangler 2.5 4 cylinder friendx4 YJ Tech Forum 20 12-17-2009 01:53 PM


logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 12:59 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC