5.7 fuel pressure test? - Jeep Commander Forums: Jeep Commander Forum
General Commander Discussion General Discussion involving the Jeep Commander goes here. If it does not fit into a more specific category below, post it here.

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 05-28-2017, 11:40 PM Thread Starter
Junior Member
Points: 902, Level: 16 Points: 902, Level: 16 Points: 902, Level: 16
Level up: 2% Level up: 2% Level up: 2%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Jan 2017
Location: Phoenix
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 96k
Posts: 18
5.7 fuel pressure test?

Does anyone here have any ideas on how to check the fuel pressure on a 5.7 ('06)? I can't find a port anywhere, and the manual makes no mention of it but does list Mopar 6631 and/or 6539 as special tools which look to me like they add a temporary port in line so you can test.
A stuck open fuel pump check valve is the only thing I can think of that would explain my symptoms but it sure would be nice to do what should be a quick and cheap fuel pressure test before dropping $240 on a fuel pump that may not be needed.
FWIW, symptoms are:
Engines cranks good and strong but won't start
On 2nd try it sputters a bit and sometimes starts, sometimes doesn't.
3rd try fires up every time like normal.
If I don't crank but just turn the key on for a few seconds, then off, on, off, and crank then it always fires right up also (i.e. what I think I am doing is priming the pump to build up pressure).
No codes have been thrown, and this happens whether it has been of for a minute for a day, hot or cold, etc.

In the meantime I dumped a bottle of fuel system cleaner in the tank hoping for some magic to happen.
kar1179 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 05-29-2017, 08:06 AM
Senior Member
Points: 3,844, Level: 39 Points: 3,844, Level: 39 Points: 3,844, Level: 39
Level up: 30% Level up: 30% Level up: 30%
Activity: 0% Activity: 0% Activity: 0%
 
2010 inferno's Avatar
 
Join Date: Feb 2016
Location: Cement City, Mi.
Own a Commander?: Yes
Model year: 2010
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 99,000
Posts: 294
Garage
Question Sound

Can you hear the fuel pump when you just turn the key on? as it sounds like the check valve also, but if you have a broken wire or a bad connection and the pump is not the getting power all the time it may have similar symptoms.


Swanny
2010 inferno is offline  
post #3 of 5 (permalink) Old 05-29-2017, 01:58 PM Thread Starter
Junior Member
Points: 902, Level: 16 Points: 902, Level: 16 Points: 902, Level: 16
Level up: 2% Level up: 2% Level up: 2%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Jan 2017
Location: Phoenix
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 96k
Posts: 18
I can't hear it at all from the driver's seat. I need to put my ear on the fill hole when my wife gets home to turn it on for me.
kar1179 is offline  
 
post #4 of 5 (permalink) Old 06-12-2017, 05:46 PM
Senior Member
Points: 7,199, Level: 56 Points: 7,199, Level: 56 Points: 7,199, Level: 56
Level up: 25% Level up: 25% Level up: 25%
Activity: 0% Activity: 0% Activity: 0%
 
AByrvalg's Avatar
 
Join Date: Mar 2010
Location: Moscow
Posts: 117
Garage
What happens if you park the vehicle in the "Nose up" position. I mean a position where the front part of the truck is higher than the rear? And what in the opposite case? Will it start faster?
AByrvalg is offline  
post #5 of 5 (permalink) Old 06-12-2017, 05:52 PM Thread Starter
Junior Member
Points: 902, Level: 16 Points: 902, Level: 16 Points: 902, Level: 16
Level up: 2% Level up: 2% Level up: 2%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Jan 2017
Location: Phoenix
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 96k
Posts: 18
I never did get the fuel pressure tested - I was going to disconnect where the fuel line connects to the fuel rail and test there but I couldn't get the line disconnected. I ended up just replacing the fuel pump and it fixed it. Due to the symptoms I was having I was unable to use the depressurization procedure but when I disconnected the lines at the pump there was no pressure anyhow, so I think it had to have been the check valve.
kar1179 is offline  
Sponsored Links
Advertisement
 
Reply

  Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > General Commander Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Jeep Commander Forums: Jeep Commander 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:
OR

Log-in











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
Display Modes
Linear Mode Linear Mode



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