Vacuum gauge for VO & #2 fuel restriction? - Ford Powerstroke Diesel Forum
Bio-Diesel/Alternative Fuels and Supplements Bio-Diesel and related Discussion. Ask Questions and discuss what has worked for you here.

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 01-28-2009, 09:01 AM
Compression Ignition Addict
 

Join Date: Sep 2007
Location: Ethereal State
Posts: 424
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Vacuum gauge for VO & #2 fuel restriction?

For those who have a vacuum gauge to monitor VO & #2 fuel filter restriction, how much difference of a vacuum reading do you see at idle and at 55 mph? You know the filter is clogged when the high vacuum reading is at idle or at 55 mph? How many inches of vacuum indicate to you to change the filter?

I realize the Super Duty fuel systems run on pressure, but the OBS is a vacuum system. I just installed a vac gauge in the cab to monitor fuel restriction. On VO there is 2" of vacuum at idle and 2" at 55 mph. On #2 I see about 2" at idle and about 7-8" at 55 mph with brand new filters so I think there may be a restriction in the #2 fuel supply line. The VO lines are 3/8" ID hose throughout. The diesel supply has 3/8" hose too but also the smaller steel line that runs under the truck. Normally there should be more vacuum on VO but that's not the case. I used compressed air and blew the diesel steel line clean but after a test drive the vacuum reading at 55 mph was still 7-8". So if I were to get 3/8" hose throughout the diesel side will the vac reading at 55 mph be like the VO reading of 2" at 55 mph since all filters are new, the VO is hot, and both have the same 3/8" ID supply lines?

So if it's normal for the vacuum to rise as you go faster why is my VO reading so much lower than my #2 reading?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 02-06-2009, 06:13 PM
WNY Biodiesel Co-op
 

Join Date: Mar 2008
Location: Orchard Park New York
Posts: 870
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
I have about 2" vac at idle and at 55mph with hot oil. It will draw more vac with colder oil buy drops as the oil heats up. The diesel side will show 0" vac both with new clean filters. As the filter loads up with contaminants it will start to pull more vac especially on hard acceleration. When the vac is steady at 15" at a steady 55mph is when its time to change the filter. I've noticed when the vac starts to climb, it won't take much more than 75 to 100 miles before I have to change the filter.
Reply With Quote Quick reply to this message
  #3  
Old 02-06-2009, 07:54 PM
Compression Ignition Addict
 

Join Date: Jun 2008
Location: Coastal NECKVILLE
Posts: 474
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
how is this plumbed in? pictures?
Reply With Quote Quick reply to this message
  #4  
Old 02-25-2009, 07:45 AM
Compression Ignition Addict
 

Join Date: Sep 2007
Location: Ethereal State
Posts: 424
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by hheynow View Post
So if it's normal for the vacuum to rise as you go faster why is my VO reading so much lower than my #2 reading?
Because the VO side has a looped return. I love answering my own questions.
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 03:28 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