Fuel Pressure / Fuel Pump - 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 10-07-2013, 08:15 AM
Powerstroke.org Fanatic
 

Join Date: Feb 2010
Location: San Antonio
Posts: 119
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Fuel Pressure / Fuel Pump

My fuel pressure is jumping between 20 and 40 psi at the schrader valve. I cleaned the regulator screen,

Is this most likely a bad fuel pump? Is the pump sitting in the valley the only fuel pump this truck has or are there transfer pumps from the two tanks?
Its a 1997 F250 SCLB 2WD

Thanks!

v=n8kfkjWktmc
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 10-07-2013, 08:37 AM
BANNED by Kris
 

Join Date: Oct 2011
Location: Pasadena, CA
Posts: 5,644
Thanks: 45
Thanked 91 Times in 86 Posts
Feedback Score: 0 reviews
It is the only pump. Technically it is two pumps in a single body as it is the transfer pump/ lift pump (low pressure, high volume) from the tanks to the bowl and then back from the bowl to the heads (high pressure pump). You can try the "BB Mod" or Cali FPR spring before replacing the pump to see if the pressure comes back.

Does the pressure raise if someone holds the motor at a higher RPM? Does the engine oil smell like fuel?
Reply With Quote Quick reply to this message
  #3  
Old 10-07-2013, 08:43 AM
Powerstroke.org Fanatic
 

Join Date: Feb 2010
Location: San Antonio
Posts: 119
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by BigFuel View Post
It is the only pump.

Does the pressure raise if someone holds the motor at a higher RPM? Does the engine oil smell like fuel?
It stays just about the same throughout ranges of RPMs...I will research and try the bb mod...

Thanks!
Reply With Quote Quick reply to this message
  #4  
Old 10-07-2013, 09:00 AM
BANNED by Kris
 

Join Date: Oct 2011
Location: Pasadena, CA
Posts: 5,644
Thanks: 45
Thanked 91 Times in 86 Posts
Feedback Score: 0 reviews
OBS FPR Shim and Gauge Install
Reply With Quote Quick reply to this message
  #5  
Old 10-07-2013, 02:20 PM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Milltown, NJ
Posts: 287
Thanks: 0
Thanked 10 Times in 10 Posts
Feedback Score: 0 reviews
Does the bb mod put more stress on the mechanical fuel pump?
Reply With Quote Quick reply to this message
  #6  
Old 10-07-2013, 02:44 PM
BANNED by Kris
 

Join Date: Oct 2011
Location: Pasadena, CA
Posts: 5,644
Thanks: 45
Thanked 91 Times in 86 Posts
Feedback Score: 0 reviews
Not really, it puts the stress on the fuel bowl. The bowl will easily handle 80 psi of backpressure but the entire system should not need to be set above 70. If the BB Mod helps it more shows that your FPR spring is worn out. You can keep the BB in there or replace the spring with either a Federal spring or a Cali spring. Just try not to have more than 70 psi.
Reply With Quote Quick reply to this message
  #7  
Old 10-07-2013, 02:50 PM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Milltown, NJ
Posts: 287
Thanks: 0
Thanked 10 Times in 10 Posts
Feedback Score: 0 reviews
Thanks. no need to stress the bowl or hoses more. I have enough leaks I am chasing.
Reply With Quote Quick reply to this message
  #8  
Old 10-07-2013, 02:56 PM
BANNED by Kris
 

Join Date: Oct 2011
Location: Pasadena, CA
Posts: 5,644
Thanks: 45
Thanked 91 Times in 86 Posts
Feedback Score: 0 reviews
Eh, hoses should be rated at 150psi. It's the o-ring at the top of the filter cap that can blow out. Seen it on my cousins SD. Single shot injector trucks spec at 50+ psi at full throttle 20 seconds after hitting that mark to operate correctly. Cali's need 60+psi. This is why there are two springs. For some the Cali spring is too much pressure and they take it back out. I more suggested the BB Mod to diagnose the issue without spending any money.
Reply With Quote Quick reply to this message
  #9  
Old 10-07-2013, 03:01 PM
Powerstroke.org Fanatic
 

Join Date: Feb 2010
Location: San Antonio
Posts: 119
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by BigFuel View Post
Eh, hoses should be rated at 150psi. It's the o-ring at the top of the filter cap that can blow out. Seen it on my cousins SD. Single shot injector trucks spec at 50+ psi at full throttle 20 seconds after hitting that mark to operate correctly. Cali's need 60+psi. This is why there are two springs. For some the Cali spring is too much pressure and they take it back out. I more suggested the BB Mod to diagnose the issue without spending any money.

Perfect...I'm going to go get a BB and try that. The truck runs horribly and I think Its definitely a fuel pressure issue. we'll see though.

I'll update as soon as i do the mod..hopefully tomorrow. Where does one acquire a single BB? lol either that or i'll buy a set of BBs and give them away to all members of the forum hahaha!
Reply With Quote Quick reply to this message
  #10  
Old 10-07-2013, 03:06 PM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Milltown, NJ
Posts: 287
Thanks: 0
Thanked 10 Times in 10 Posts
Feedback Score: 0 reviews
I just changed the hoses with FI hose, but I dont like the way the clamps are squeezing the hose, I am going to get some Russell black nylon braid hose and redo them. For piece of mind.
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:
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 07:27 PM.


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