Fuel System Pressure Release Procedure - JeepForum.com

 
LinkBack Thread Tools
post #1 of 11 Old 02-28-2011, 11:21 AM Thread Starter
rrasco
Registered User
1999 TJ Wrangler 
 
Join Date: Apr 2010
Location: TEXAS
Posts: 106
Fuel System Pressure Release Procedure

I need to drop the fuel tank to install my rear bumper, my question is: is it really necessary to jump the injectors after you stall the vehicle by starving the engine of fuel?

Quote:
FUEL SYSTEM PRESSURE RELEASE
PROCEDURE
Use following procedure if fuel rail is or is
not equipped with fuel pressure test port.
(1) Remove fuel fill cap.
(2) The fuel filler tube contains a spring-loaded
flap (door) located below fuel fill cap. The flap is used
as a secondary way of sealing fuel tank if fuel fill cap
has not been properly tightened. It is part of EVAP
monitor system when vehicle is equipped with a
Leak Detection Pump (LDP). The vehicle may be
equipped with flap installed into fuel filler tube
even though vehicle is not equipped with LDP
and EVAP monitor system. Place a nonmetallic
object into fuel fill tube and press on flap to relieve
any tank pressure.
(3) Remove Fuel Pump relay from Power Distribution
Center (PDC). For location of relay, refer to label
on underside of PDC cover.
(4) Start and run engine until it stalls.
(5) Attempt restarting engine until it will no
longer run.
(6) Turn ignition key to OFF position.
CAUTION: Steps 1, 2, 3 and 4 must be performed to
relieve high pressure fuel from within fuel rail. Do
not attempt to use following steps to relieve this
pressure as excessive fuel will be forced into a cylinder
chamber.
(7) Unplug connector from any injector.
(8) Attach one end of a jumper wire with alligator
clips (18 gauge or smaller) to either injector terminal.
(9) Connect other end of jumper wire to positive
side of battery.
(10) Connect one end of a second jumper wire to
remaining injector terminal.
CAUTION: Powering an injector for more than a few
seconds will permanently damage the injector.
(11) Momentarily touch other end of jumper wire
to negative terminal of battery for no more than a
few seconds.
(12) Place a rag or towel below fuel line quick-connect
fitting at fuel rail.
(13) Disconnect quick-connect fitting at fuel rail.
Refer to Quick-Connect Fittings in this section.
(14) Return fuel pump relay to PDC.
(15) One or more Diagnostic Trouble Codes (DTC’s)
may have been stored in PCM memory due to fuel
pump relay removal. The DRB scan tool must be
used to erase a DTC. Refer to Group 25, Emission
Control System. See On-Board Diagnostics.



Build Thread:
http://www.jeepforum.com/forum/f22/rrascos-99-tj-build-1129303/
rrasco is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 02-28-2011, 11:24 AM
Zen
Registered User
2005 LJ Wrangler 
 
Join Date: Jun 2009
Location: Rockwall
Posts: 1,074
No, not really necessary. You will spill more fuel than what is acceptable for a pro shop. Put rags under the test port and bleed off the remaining pressure.

-Darkstar, judy-judy. I'm going in for guns.
--
-Stick, splash one!
Zen is offline  
post #3 of 11 Old 02-28-2011, 11:27 AM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 66,567
X2. It's simple however on your '98 to just push the pressure release pin in the Schraeder valve located on the fuel rail after stuffing a rag underneath it to catch the small amount of gasoline that will spray out of the valve. The Schraeder valve is under a big black plastic screw-on cap on the fuel rail and it looks just like a big oversized tire inflation valve.

Getting
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
...


When you have a choice, buy American.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Jerry Bransford is online now  
post #4 of 11 Old 02-28-2011, 11:35 AM
white305
Registered User
2006 LJ Wrangler 
 
Join Date: Jul 2009
Location: Hartville, OH
Posts: 129
Rokmen had a youtube video for installing their gt skid plate. I followed it and didn't have any issues. Might help.
white305 is online now  
post #5 of 11 Old 02-28-2011, 11:49 AM Thread Starter
rrasco
Registered User
1999 TJ Wrangler 
 
Join Date: Apr 2010
Location: TEXAS
Posts: 106
Quote:
Originally Posted by white305 View Post
Rokmen had a youtube video for installing their gt skid plate. I followed it and didn't have any issues. Might help.
Good video. I was curious, I am only dropping the fuel tank to get to the backside of the frame to install the extra bumper bolts. In this video, they lowered the fuel tank prior to disconnecting the hoses and appeared to have access to the frame. Would it be possible for me to lower the fuel tank enough to install the bolts without having to disconnect all the hoses?

Build Thread:
http://www.jeepforum.com/forum/f22/rrascos-99-tj-build-1129303/
rrasco is offline  
post #6 of 11 Old 02-28-2011, 11:58 AM
TheBoogieman
Satan's coming for you
 
TheBoogieman's Avatar
2000 TJ Wrangler 
 
Join Date: Aug 2006
Location: CharlottesHELL
Posts: 34,145
Quote:
Originally Posted by rrasco View Post
Good video. I was curious, I am only dropping the fuel tank to get to the backside of the frame to install the extra bumper bolts. In this video, they lowered the fuel tank prior to disconnecting the hoses and appeared to have access to the frame. Would it be possible for me to lower the fuel tank enough to install the bolts without having to disconnect all the hoses?
Are you towing ? If not it's a waste of time.Use the stock mounts.
TheBoogieman is offline  
post #7 of 11 Old 02-28-2011, 11:59 AM
white305
Registered User
2006 LJ Wrangler 
 
Join Date: Jul 2009
Location: Hartville, OH
Posts: 129
prob not. you need to be slow lowering the tank down and make sure you disconnect the fuel lines. It can be costly if you snap the plastic clips where the fuel line attaches to the fuel pump. All I can tell you is I followed the video and it worked out fine for me. I remember the on clip was kind of a pain, but patience prevailed.
white305 is online now  
post #8 of 11 Old 02-28-2011, 12:14 PM Thread Starter
rrasco
Registered User
1999 TJ Wrangler 
 
Join Date: Apr 2010
Location: TEXAS
Posts: 106
Quote:
Originally Posted by TheBoogieman View Post
Are you towing ? If not it's a waste of time.Use the stock mounts.
No. I will be using hitch accessories, but wasn't planning to tow anything b/c as far as I know, the built-in hitch is not tow-rated. Although I'm sure I could do some light towing, I wasn't planning to. Would be a nice option if I could though.

I thought the extra bolts were for the tow hooks and added weight of a tire carrier....?

Build Thread:
http://www.jeepforum.com/forum/f22/rrascos-99-tj-build-1129303/
rrasco is offline  
post #9 of 11 Old 03-04-2011, 11:42 AM Thread Starter
rrasco
Registered User
1999 TJ Wrangler 
 
Join Date: Apr 2010
Location: TEXAS
Posts: 106
Just to update this in case anyone comes across the same problem....

I was able to install the bumper without completely removing the fuel tank or disconnecting any lines. Initially, I was planning to remove the tank, but after I lowered it like they did in the video and was ready to disconnect the fuel hoses and electrical connection, I was able to gain access to the inside of the frame enough to install the bolts for the bumpers. That's it, job done. Pretty simple actually.

Build Thread:
http://www.jeepforum.com/forum/f22/rrascos-99-tj-build-1129303/
rrasco is offline  
post #10 of 11 Old 03-04-2011, 12:56 PM
Knuckelhead
AFSOC Retired
 
Knuckelhead's Avatar
2000 TJ Wrangler 
 
Join Date: Aug 2005
Location: Colorado
Posts: 20,222
Quote:
Originally Posted by TheBoogieman View Post
Are you towing ? If not it's a waste of time.Use the stock mounts.
It's not "a waste of time" to install all of the recommended mounting hardware for a tire carrier bumper...
Knuckelhead is offline  
post #11 of 11 Old 03-04-2011, 02:03 PM Thread Starter
rrasco
Registered User
1999 TJ Wrangler 
 
Join Date: Apr 2010
Location: TEXAS
Posts: 106
I obtained the Smittybilt installation instructions and it does say the inner mounting points are 'optional'. But....why would they even consider providing them if they were not necessary? My view on it is, I'd rather be safe than sorry. Especially if I use the hitch or tow points. This bumper was a PITA to install, but then again everything I install seems to throw me curve balls. On the bright side, I now know how to remove the fuel tank from a TJ and even have a jig to support the tank when doing so.

Build Thread:
http://www.jeepforum.com/forum/f22/rrascos-99-tj-build-1129303/
rrasco 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
How do you release the fuel pressure at the fuel rail on a 2005 4.0? msully TJ Wrangler Technical Forum 7 11-14-2010 01:11 PM
Fuel System Release Procedure beckham388 TJ Wrangler Technical Forum 0 07-06-2008 07:28 AM
"Fuel System Pressure Release Procedure" HUH? JBWood05TJ TJ Wrangler Technical Forum 13 03-09-2008 02:27 PM
Fuel Pressure release, 06 Rubicon? Howitzer TJ Wrangler Technical Forum 4 12-30-2007 10:43 PM
Fuel pressure release Im Rebel TJ Wrangler Technical Forum 7 08-20-2005 09:37 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 Off
Pingbacks are On
Refbacks are On

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