Low Fuel Pressure. - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-04-2011, 09:35 AM
Compression Ignition Addict
 

Join Date: Jul 2010
Location: Washington, Pa
Posts: 710
Thanks: 29
Thanked 17 Times in 17 Posts
Feedback Score: 2 reviews
Low Fuel Pressure.

OK so have all the mods in my sig. I have been watching my fuel pressure gauge and noticed I'm losing fuel pressure when i get on the truck half pedal or more on acceleration. Its going down to 35 lbs, and REAL QUICK. I added a fpr shim and it keeps my idle and low speed pressure much better... around 60-70 lbs. Initially I was thinking that the mech fuel pump just couldn't keep up, but Cody at PHP said that the stocker will keep up with the stage 1's... And I know its not weak because the one that is in it now is brand new from Ford... Only about 3 weeks old.

Any ideas where I might be getting restrictions?


Cody told me to switch tanks and see if the sending unit screen is plugged up... But it does it on both tanks.... maybe both screens are plugged? I change my fuel filter religously, about every other oil change, so around 8K or so. This fuel filter is about 2 weeks old.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 10-04-2011, 11:21 AM
Compression Ignition Addict
 

Join Date: Oct 2011
Location: Tehachapi, CA
Posts: 1,540
Thanks: 0
Thanked 16 Times in 16 Posts
Feedback Score: 0 reviews
Check the FPR screen for crud. Does your 96 have the Fuel restriction Sensor on the FPR block? If so, I think there is another steel wool-type screen in the line that comes up into the bottom of the FPR. Check that too if you have it. Cheers!
Reply With Quote Quick reply to this message
  #3  
Old 10-04-2011, 11:26 AM
Compression Ignition Addict
 

Join Date: Jul 2010
Location: Washington, Pa
Posts: 710
Thanks: 29
Thanked 17 Times in 17 Posts
Feedback Score: 2 reviews
Quote:
Originally Posted by Patrick Feeley View Post
Check the FPR screen for crud. Does your 96 have the Fuel restriction Sensor on the FPR block? If so, I think there is another steel wool-type screen in the line that comes up into the bottom of the FPR. Check that too if you have it. Cheers!
I put in another screen from a spare motor I have about month and half ago or so... However I was unaware of the fuel restriction sensor... What exactly is the function of the FRS? I will check that tonight.

Thanks!
Reply With Quote Quick reply to this message
  #4  
Old 10-04-2011, 11:44 AM
Compression Ignition Addict
 

Join Date: Jul 2010
Location: Washington, Pa
Posts: 710
Thanks: 29
Thanked 17 Times in 17 Posts
Feedback Score: 2 reviews
I do have another line running into the bottom of the FPR. Is the screen right in the line or up underneath the FPR? I have a spare motor with another FPR on it and I'm contemplating just swaping the whole thing out.
Reply With Quote Quick reply to this message
  #5  
Old 10-04-2011, 03:56 PM
Compression Ignition Addict
 

Join Date: Apr 2011
Location: Salem, IN
Posts: 999
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Check for leaks.
Reply With Quote Quick reply to this message
  #6  
Old 10-04-2011, 07:52 PM
Compression Ignition Addict
 

Join Date: Oct 2011
Location: Tehachapi, CA
Posts: 1,540
Thanks: 0
Thanked 16 Times in 16 Posts
Feedback Score: 0 reviews
For pictures of the strainer (that's what its called I guess), see post #18 of this thread: 1st gen PSD + VO + stock FPR = $h*t
Cheers!
Reply With Quote Quick reply to this message
  #7  
Old 10-05-2011, 11:04 AM
Compression Ignition Addict
 

Join Date: Jul 2010
Location: Washington, Pa
Posts: 710
Thanks: 29
Thanked 17 Times in 17 Posts
Feedback Score: 2 reviews
Update...

I found that the FPR spring was bent... Ordered a new one from Ford and put it in. Now my idle pressure is ~77 psi, my driving pressure is anywhere from 70-80 psi. and When I get on it hard it drops to around 50... Numbers more normal? I'm not sure what the full load psi is supposed to be... I just know its not suppsed to be 35 psi like it was before.

However if I'm doing 70 mph and just let off the throttle it will go up 90 psi. No shim anymore... just the spring.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

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.



Thread Tools
Display Modes

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



All times are GMT -8. The time now is 11:52 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors