98 ZJ Do I need a new Fuel Pump - JeepForum.com

 
LinkBack Thread Tools
post #1 of 2 Old 09-20-2009, 10:10 AM Thread Starter
purple_jeep
Registered User
1998 ZJ 
 
Join Date: Apr 2007
Location: Tucson AZ
Posts: 182
Garage
98 ZJ Do I need a new Fuel Pump

Hi Guys,

I think I need a new fuel pump but I thought I would check here first. The problem is when its been sitting for a while it takes alot longer then normal to start. I bought a Fuel pressure meter and these are the readings I got:

Normal pressure when Its been running is about 42psi
Cold pressure first thing in the morning 22psi
Cold pressure if I turn the key on then off without starting then on again is 42psi

When I did the key on and off then on again I was able to start straight away.

I also just replaced the PCM for another issue.

Thoughts?

Cheers

Chris

purple_jeep is offline  
Sponsored Links
Advertisement
 
post #2 of 2 Old 09-24-2009, 07:01 PM
ytudrepus
Registered User
1994 ZJ 
 
Join Date: Jul 2009
Location: Dillsburg PA
Posts: 7
There's a bypass valve on the fuel rail.

I could be sticking, there is a procedure to check in the Hanes manual.
ytudrepus 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
New aftermarket high quality fuel pump? second pump in 3 years?!!!!? SPL Tech ZJ Grand Cherokee Forum 8 11-02-2010 05:12 PM
Fuel Pump & Fuel Lines - Connections jeremiahgreer ZJ Grand Cherokee Forum 5 02-02-2010 04:19 PM
No fuel pressure, Fuel Pump? CPS? ECU? Relay? 95cherokee33s ZJ Grand Cherokee Forum 2 10-22-2008 08:57 PM
Fuel Pump/Fuel Tank Problem ma-usa1 ZJ Grand Cherokee Forum 18 04-09-2008 07:28 PM
Fuel Pump/Fuel Tank Problem ma-usa1 ZJ Grand Cherokee Forum 0 02-05-2003 06:02 PM

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