Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum > 98 TJ died Fuel Pump?

Join Wrangler Forum Today


Thread: 98 TJ died Fuel Pump? Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

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:
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.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
03-30-2014 11:27 AM
Ifixyawata It's one of the ones that doesn't have a Schraeder valve on the fuel rail. Being that I'm not in a position to spend $50 on an adapter just to be able to measure fuel pressure is there anything else I can check?
03-24-2014 01:41 PM
Digger84 measure rail pressure
03-24-2014 01:02 PM
Ifixyawata Ok, I don't usually like to resurrect threads but my issue doesn't really warrant a new one. Regarding my wife's '97 TJ 2.5; I had started the process of diagnosing a no-start condition and I had determined successfully that it's getting spark.

I moved on to the step-by-step (as mentioned above) of diagnosing the fuel pump. First off I did it myself and had my neighbor listen, too, and there is no audible sound coming from the tank. The fuel pump isn't making any noise at all, that I can hear. I did the relay switch-around and determined that the fuel pump relay was good. I got back to the harness connector at the tank and realized I've misplaced my multimeter. Being that it's almost time for me to leave for work, I hooked the harness back together and, just to see, I tried to start it once again. A few times it might have fired once or twice and then went back to just cranking over. I tried once while holding down the accelerator and it started, rand and idled fine.

My question is, should I still continue to diagnose this? Is it still possible that the fuel pump is bad? Could I have a pump that's only working some of the time? Just low fuel pressure? To make sure I wasn't crazy I pulled the fuel pump relay out while it was running and it started dying within a second or two.
06-11-2013 09:44 AM
j33p3rz cr33p3rz The 2 to 3 sec wait to start works most of the time.
06-08-2013 04:47 PM
j33p3rz cr33p3rz Well today I noticed it took the jeep about 3 to 5 secs to start.Its been firing rite up.Is this normal?It happened after I took it for a ride then it sit an hour then it happened. Other than that seems to be fine.
06-06-2013 05:54 PM
j33p3rz cr33p3rz Thanks for the help guys.Took 2.5 hours had to cut 2 skid plate bolts other than that it went smooth.
06-06-2013 05:41 PM
s14sh3r Good deal!
06-06-2013 05:36 PM
Jerry Bransford Awesome, good work!!!
06-06-2013 05:33 PM
j33p3rz cr33p3rz All done guys yee hoo she's up and running.
06-06-2013 02:35 PM
ChaddG I took my ring off with a small block of wood and a small hammer.
amazon.com has your fuel pump for 145.00.
Amazon.com: Spectra Premium SP7115M Fuel Pump Module for Jeep Wrangler: Automotive
I will ship you mine for 80.00
06-06-2013 01:40 PM
s14sh3r
Quote:
Originally Posted by Jerry Bransford View Post
Go get a big strap wrench today to make tonight's job much easier. The fuel pump is held down into the gas tank by a big plastic/nylon lock ring which isn't easily removed without a strap wrench. Lowes, Home Depot, etc. will have them in the bigger size needed in their plumbing departments, I never saw any big enough in their tool departments.

Like this...



You can see how large that lock ring is in the below picture, it's that big white ring.

That would have helped tremendously when I did mine. I can think of several other times I could have used one of those. I need to remember to get one next time I got to Lowe's.
06-06-2013 11:49 AM
j33p3rz cr33p3rz Thanks 3 more hours of work left then off to get it done.I'll update later.Thanks a lot guys for the help.
06-06-2013 10:10 AM
Jerry Bransford Go get a big strap wrench today to make tonight's job much easier. The fuel pump is held down into the gas tank by a big plastic/nylon lock ring which isn't easily removed without a strap wrench. Lowes, Home Depot, etc. will have them in the bigger size needed in their plumbing departments, I never saw any big enough in their tool departments.

Like this...



You can see how large that lock ring is in the below picture, it's that big white ring.
06-06-2013 08:30 AM
j33p3rz cr33p3rz Going to attempt this tonight.
06-05-2013 06:36 PM
Jerry Bransford
Quote:
Originally Posted by j33p3rz cr33p3rz View Post
Basic stripped down?Sorry I'm dumb on this stuff its factory sahara with AC no power windows or locks or anything. Tried Google but keep coming up with 15 or 19
A Sahara with a/c is far from being a stripped down model. 99.9999% chance it has the 19 gallon tank.
06-05-2013 05:14 PM
s14sh3r Put your VIN in here and it will tell you everything that came on your Jeep, including the tank size.

Comprehensive Chevrolet, Saturn, GMC, Hummer, Cadillac, Buick, Oldsmobile, Pontiac, Geo, Dodge, Plymouth, Jeep, Chrysler, Ford, Lincoln, Mercury, Mazda Truck, Mercedes VIN Decoder
06-05-2013 04:39 PM
j33p3rz cr33p3rz
Quote:
Originally Posted by Jerry Bransford View Post
Unless your TJ is a very basic stripped down model, your gas tank is very likely the 19 gallon version. Few actually came with the 15 gallon tank.
Basic stripped down?Sorry I'm dumb on this stuff its factory sahara with AC no power windows or locks or anything. Tried Google but keep coming up with 15 or 19
06-05-2013 04:18 PM
Jerry Bransford Unless your TJ is a very basic stripped down model, your gas tank is very likely the 19 gallon version. Few actually came with the 15 gallon tank.
06-05-2013 04:02 PM
j33p3rz cr33p3rz What about this one like I sad money is tight trying to get this thing going need my jeep back bad riding the bike is getting old.

PRECISE Part # 402P7115MN

I couldnt get it to link for some reason
06-05-2013 03:43 PM
j33p3rz cr33p3rz Also I'm not 100 percent sure what size the tank is 15 or 19 it does have the 4.0
06-05-2013 03:30 PM
j33p3rz cr33p3rz
Quote:
Originally Posted by Jerry Bransford View Post
Have you checked out the pricing at RockAuto Parts Catalog as I suggested above in post #35?
Which would you recommended from there?If you ever get time to check it out.
06-05-2013 03:28 PM
j33p3rz cr33p3rz
Quote:
Originally Posted by Jerry Bransford View Post
Have you checked out the pricing at RockAuto Parts Catalog as I suggested above in post #35?
Yes I have guess I should check and see how fast it can be delivered.
06-05-2013 03:22 PM
Jerry Bransford Have you checked out the pricing at RockAuto Parts Catalog as I suggested above in post #35?
06-05-2013 03:19 PM
j33p3rz cr33p3rz
Quote:
Originally Posted by ChaddG View Post
I just ordered a sending unit from amazon. It cost me 145.00.
the fuel pump alone as almost that much anywhere else.
I got the spectra premium sending unit.
I have an old sending unit that needs a new filter, could sell it to you
it works but no guarantee's on how long. It has 89k miles on it
p.m. me if your interested
Wish you were in Indiana I have to get one tomorrow and the whole fuel pump assembly here is $250.00 to 300.00 o.0
06-05-2013 02:22 PM
ChaddG I just ordered a sending unit from amazon. It cost me 145.00.
the fuel pump alone as almost that much anywhere else.
I got the spectra premium sending unit.
I have an old sending unit that needs a new filter, could sell it to you
it works but no guarantee's on how long. It has 89k miles on it
p.m. me if your interested
06-04-2013 06:15 PM
j33p3rz cr33p3rz Plug testing OK looks like I'll be ordering a pump.
06-04-2013 02:39 PM
j33p3rz cr33p3rz
Quote:
Originally Posted by s14sh3r View Post
Here's a good write up on replacing the pump: DailyDrivenTJ-Fuel Pump Repair

Here is a picture of the connector

The red tab in the middle of the connector locks the two halves together. Push it to one side to unlock. It will only push one way. I personally would verify that the pump is getting power before dropping the tank. When you unplug the connector, you can pull the harness out of the clips that hold it and you will have enough slack to pull it out from under the jeep. It makes it a hell of a lot easier to test that way. Find the black wire and the green wire with a yellow stripe. Those are your ground and positive, respectively. connect the leads from your multimeter or test light to them and turn the key on. You should get 12+ volts for 2 to 3 seconds.
Thank you for the info going to head back over here in awhile I'll test the plug.
06-04-2013 02:30 PM
s14sh3r Here's a good write up on replacing the pump: DailyDrivenTJ-Fuel Pump Repair

Here is a picture of the connector


The red tab in the middle of the connector locks the two halves together. Push it to one side to unlock. It will only push one way. I personally would verify that the pump is getting power before dropping the tank. When you unplug the connector, you can pull the harness out of the clips that hold it and you will have enough slack to pull it out from under the jeep. It makes it a hell of a lot easier to test that way. Find the black wire and the green wire with a yellow stripe. Those are your ground and positive, respectively. connect the leads from your multimeter or test light to them and turn the key on. You should get 12+ volts for 2 to 3 seconds.
06-04-2013 02:06 PM
Jerry Bransford The only electrical plug that connects through the gas tank skidplate on the driver's side is for the fuel pump. Push on it to make sure the plug is solidly seated & if the fuel pump doesn't turn on then off after that when you cycle the ignition switch on, odds are good the fuel pump itself is bad.
06-04-2013 01:49 PM
j33p3rz cr33p3rz
Quote:
Originally Posted by s14sh3r View Post
I replaced just he pump on mine. It has a Bosch pump on it from the factory, so that's what I replaced it with. Advance Auto carries them. It wasn't hard to replace, there's even a video on youtube.

Guessing at it being a CPS problem is just that, a guess. Diagnosing automobile problems is no different from diagnosing anything else. I work on computers and the diagnostic method itself is exactly the same.

As Jerry said, the fuel pump should cycle for 2-3 seconds after you turn the key on. Don't get ahead of yourself by assuming anything. Too many people make that mistake and then they'll say "I've replaced everything and the problem is still there!". That comes from guessing instead of diagnosing. I know, I was one of those people at one time. Follow logical steps and don't get ahead of yourself.

It sounds like you're unsure of where the plug to the fuel pump module is located and may have trouble disconnecting it when you find it. I'll see if I can round up a picture or something.

Don't get discouraged!
A pic would be great I see a plug there but I don't have the tank off yet.I'm sure its not that hard of a job to do.Just hope that's the problem seems like it is though.
This thread has more than 30 replies. Click here to review the whole thread.

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


All times are GMT -5. The time now is 04:38 PM.



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