2010 Wrangler Sahara - JKowners.com : Jeep Wrangler JK Forum
  • 2 Post By ronjenx
LinkBack Thread Tools Display Modes
post #1 of 2 Old 02-20-2019, 06:52 PM Thread Starter
Join Date: Jan 2019
Posts: 1
Feedback: 0 reviews
2010 Wrangler Sahara

my jeep is puking gas back out of tank after pump shuts off when full... Any body having this problem and, or fix? thanks
sg003 is offline  
Sponsored Links
post #2 of 2 Old 02-20-2019, 07:16 PM
Rock God
ronjenx's Avatar
Join Date: Aug 2010
Location: Maine
Posts: 1,867
Feedback: 0 reviews

That was a common problem with the early JKs. Ethanol in the fuel caused the check valve in the tank to swell so it would not close when the tank became full.

At first, the whole tank with an updated valve was replaced. Later on, they developed a check valve that could be inserted in the filler tube, about half way between the gas cap and the tank.

Look at your filler tube from under the vehicle. If it's a simple tube all the way to the tank, your JK does not have the new larger diameter section of tube with the added check valve.

To get the new check valve look up this part number: CNNNX321ac
You will remove a section of the original tube, and insert the new, larger diameter tube with the check valve in it.

This is assuming a swollen OEM check valve in your tank is the problem.

2008 Unlimited Rubicon Automatic

Last edited by ronjenx; 02-20-2019 at 07:32 PM.
ronjenx is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the JKowners.com : Jeep Wrangler JK 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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
2010 Jeep Wrangler Sahara 4dr jdemonto For Sale 2 01-17-2010 12:45 AM

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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome