Loosing fuel pressure - Ford Powerstroke Diesel Forum

 
LinkBack Thread Tools Display Modes
post #1 of 5 Old 11-21-2012, 09:14 AM Thread Starter
Member
 
Join Date: Oct 2009
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Loosing fuel pressure

Loosing fuel pressure, Can’t find any leaks? Once I start my truck the gauge reads 0 and if it let it idle there for a while it will eventually climb to mid 50’s (a few minutes idling) and then stay constant and even at wide open throttle it will only drop to 50psi. I recently changed the blue spring, the one that was in there would only give 40-42 psi the new one gives me 55psi, the old one was just over a year old. The install was straight forward doubt I messed that up but there is no fuel leaking anywhere.

First I was getting and still am horrible fuel mileage so I installed a fuel pressure gauge
Found out I was low fuel pressure low 40’s
I changed fuel filter at every oil change but I decided to change them again to see if it would help no change
I thought it was the pump because the upgraded blue spring was only around 1 year old so I replaced the pump no change! So I wasted money on the pump
Also started to notice the fuel pressure would build very slow but stay steady
Installed a new spring and pressure builds to 55psi but still builds very slow and will only build at idle or low rpm not driving around

What can this be? Could the low fuel pressure be what my horrible MPG is related to?

Thanks for your time any input is greatly appreciated! I need this fixed asap! The fuel mileage is killing me and I don’t want to do any more damage to the injectors!

2008 6.4 diesel, dpf and egr delete. running gearboxz for tune
rizzamike is offline  
post #2 of 5 Old 11-21-2012, 12:42 PM
Premium Member
 
southend's Avatar
 
Join Date: Jan 2012
Location: Gulf Coast
Posts: 5,201
Thanks: 1
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 1 reviews
Is it a mechanical guage? Your truck cannot run on 0 psi fuel. Low fuel pressure would kill injectors real quick. Maybe your guage is taking a vacation? Many things csn cause bad fuel mileage, probably including low fuel pressure.

Sent from my phone that somebody didn't help me get.

Unfortunately had to Sell my ......2004 KR CC SWB FX4 - Edge insight cts, blue spring upgrade, updated HFCM drain plug, XDP coolant filter, CAT EC-1 rated coolant, Custom Diesel EGR delete, CAT delete, Rotella T6

SEE MY OIL COOLER REPLACEMENT AND EGR DELETE - http://www.powerstroke.org/forum/gen...tml?highlight=
southend is offline  
post #3 of 5 Old 11-22-2012, 07:39 AM Thread Starter
Member
 
Join Date: Oct 2009
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Thanks for the response, I decided to go to the dealer yesterday and purchase a new regulator kit, I was surprised to find what was wrong with my truck! I totally see it as my fault for not looking but a year ago when I updated to the blue spring I just purchased the spring not the kit, changed the spring and have been running it ever since. It was missing the O-ring or seal that mounts to the plastic sleeve in the housing. My truck has always run great no issues except for bad fuel mileage that was why I decided not to long ago to purchase a fuel pressure gauge to see if it was a possibility, Looks like that was my main problem! I fought with it for weeks new filters, replaced the pump, I even added the bb to the blue spring that was when the pressure gauge would read 0 then slowly climb and hold but without the bb it would be a steady 40-45. Last night once I changed the complete kit that I cheeped out on the first time the pressure sored to 70psi with just the key on and even stayed there once the truck was started and at wide open throttle it still only drops about 5psi. Finally it is working the way it is supposed to! But now I am even more concerned! How has my truck rum ok for this long on low fuel pressure? It has been more than a year! I changed the spring a year ago and the thing was installed wrong from the previous owner! It has been running this way for over 2 years! When I got the truck I got 14-15mpg city and 17-19mpg highway, I have only been getting 11-12mpg for a while!
Are my injector shot now?
Would this have done damage to something else?
Should my mileage improve?

Thanks for any input, I needed to find this out! I spent almost $9000 in fuel last year!

2008 6.4 diesel, dpf and egr delete. running gearboxz for tune
rizzamike is offline  
post #4 of 5 Old 11-22-2012, 03:24 PM
Premium Member
 
southend's Avatar
 
Join Date: Jan 2012
Location: Gulf Coast
Posts: 5,201
Thanks: 1
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 1 reviews
Thanks for the update.

Sent from my phone that somebody didn't help me get.

Unfortunately had to Sell my ......2004 KR CC SWB FX4 - Edge insight cts, blue spring upgrade, updated HFCM drain plug, XDP coolant filter, CAT EC-1 rated coolant, Custom Diesel EGR delete, CAT delete, Rotella T6

SEE MY OIL COOLER REPLACEMENT AND EGR DELETE - http://www.powerstroke.org/forum/gen...tml?highlight=
southend is offline  
post #5 of 5 Old 11-22-2012, 03:55 PM
Premium Member

 
twoicebergs's Avatar
 
Join Date: Sep 2008
Location: Oakbank, Manitoba
Posts: 3,429
Thanks: 8
Thanked 125 Times in 117 Posts
Mentioned: 4 Post(s)
Quoted: 36 Post(s)
Feedback Score: 0 reviews
Good catch for round 2. As far as possible damage to injectors, only time will tell. Since you haven't experienced any other issues except low fuel economy, you should have your answer in a few tankfuls.

Frank
2007 F-250 Lariat Crew. MBM 190/50s,
KC-68 Stage 3 Turbo,
DashBoss/F/P, and a few other goodies
Stiction Problems - Fix it yourself! - http://www.powerstroke.org/forum/gen...ml#post4509754
Want to modify your injectors DIY - http://www.powerstroke.org/forum/6-0...ger-flows.html

Working for Toys
twoicebergs is offline  
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:
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









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
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