Big Time fuel pressure relief when I open gas cap - JeepForum.com
 
LinkBack Thread Tools
post #1 of 7 Old 10-08-2010, 04:05 PM Thread Starter
pbj-tj
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2008
Location: Detroit
Posts: 333
Big Time fuel pressure relief when I open gas cap

94 JGC Laraedo 5.2 quadratrac
190,000 miles

So, this is pretty similar to when you run your tank close to empty open the gas cap and you hear the fumes make a vaccume or hissing sound.

Mine is doing it even when there is a half tank of gas... and its crazy pressure, it litterally relieves itself for almost 10 seconds.

does anyone know what is causing this? Never experienced this on any of my 20 vehicles.

only thing I can possibly think of is a clogged injector or fuel filter causing the pressure build up?


(Building up my 1997 TJ - LS1 V8 Swap and more.. here's my thread)http://www.jeepforum.com/forum/f9/2-5l-4-cyl-ls1-v8-conversion-679907/
pbj-tj is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 10-08-2010, 04:37 PM
jeepjones
Registered User
1998 TJ Wrangler 
 
Join Date: Nov 2008
Location: Calgary
Posts: 64
What about your EVAP canister or lines?
jeepjones is offline  
post #3 of 7 Old 10-08-2010, 10:31 PM Thread Starter
pbj-tj
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2008
Location: Detroit
Posts: 333
I could look at that thanks, any other ideas?

(Building up my 1997 TJ - LS1 V8 Swap and more.. here's my thread)http://www.jeepforum.com/forum/showthread.php?t=679907
pbj-tj is offline  
post #4 of 7 Old 10-09-2010, 10:21 AM Thread Starter
pbj-tj
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2008
Location: Detroit
Posts: 333
really wondering what may be causing this, im not sure if this is common on this year zj? this ever happen to anyone?

(Building up my 1997 TJ - LS1 V8 Swap and more.. here's my thread)http://www.jeepforum.com/forum/showthread.php?t=679907
pbj-tj is offline  
post #5 of 7 Old 10-09-2010, 01:11 PM
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Posts: 19,793
clogged evap line. the fuel pump can suck the tank hard enough to collapse it if it's not vented through the evap system correctly.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

ratmonkey is offline  
post #6 of 7 Old 10-09-2011, 09:36 AM
Tmark
Registered User
1996 ZJ 
 
Join Date: Sep 2005
Location: canton, ohio
Posts: 25
is the pressure build up in the gas tank usually always the Evap canister??? what about the purge solenoid??

mine seems to only build up the pressure when I get below 1/4 tank. Would this problem throw a code??

thanks
Tim
Tmark is offline  
post #7 of 7 Old 10-09-2011, 10:52 AM
HighLonesome
Belief In All Things Jeep
 
HighLonesome's Avatar
1995 ZJ 
 
Join Date: Feb 2005
Location: New Mexico
Posts: 6,769
I had it happen on my 94. So much pressure gas would be ejected (onto me ) when I removed the cap. I got a vented cap and that problem hasn't reoccurred in the last two years. I'm sure my evap system is trashed.
HighLonesome 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
What are symptoms of faulty fuel pressure regulator/fuel pump Tehnation ZJ Grand Cherokee Forum 4 09-13-2010 11:39 AM
No fuel pressure, Fuel Pump? CPS? ECU? Relay? 95cherokee33s ZJ Grand Cherokee Forum 2 10-22-2008 08:57 PM
Time to replace oem 225/75/16 tires, open for suggestions. metalgod ZJ Grand Cherokee Forum 2 04-07-2007 12:12 PM
Fuel Pressure Adriansaxton ZJ Grand Cherokee Forum 4 03-19-2007 11:18 AM
Fuel Pressure Adriansaxton ZJ Grand Cherokee Forum 2 03-18-2007 02:34 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