Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 12-25-2013, 02:17 AM
390Highboy 390Highboy is offline
Senior User
 
Join Date: Jul 2006
Posts: 184
390Highboy is starting off with a positive reputation.
Adjustable FPR on a 460? Need advice

So I installed a Holley adjustable fuel pressure regulator on my 90 efi 460. From the articles I have read, everyone says to set it at 41 psi. Does this mean 41 psi at an idle with vacuum line connected? Or disconnected? Or 41 psi at wot with vacuum line connected? I can't seem to find any info on it. I am currently running it at 41 psi at idle with the vacuum line connected, and it runs good with better power, but I don't want to screw it up.
Reply With Quote
  #2  
Old 12-25-2013, 07:56 AM
subford's Avatar
subford subford is online now
Post Fiend
 
Join Date: Aug 2005
Location: Easton,Ks
Posts: 17,262
subford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud of
It baffles me why anybody would put an adjustable fuel pressure regulator on unless they are running a carburetor.

The fuel injectors need 39.2psi across them at all times for maximum fuel burn. That is what our era V8 Ford trucks are set to with a factory fuel pressure regulator.

A fuel gauge at the fuel rail will be from 30psi to 42psi depending on the V8 engines vacuum/pressure. This is to maintain the 39.2psi fuel pressure across the injector.

The ones who told you 41psi that would be with no vacuum (engine not running) with the fuel pumps running.
__________________
95 F150 302 4R70W EB EX-CAB
94 F53 460 E4OD COACHMEN SANTARA RV
83 F150 Flare Side 351W AOD
77 F250 351M-2V NP 435/4 Speed 4X4
subford@gmail.com
Bill K, Kansas Chapter
Reply With Quote
  #3  
Old 01-01-2014, 08:53 PM
UNTAMND's Avatar
UNTAMND UNTAMND is offline
Postmaster
 
Join Date: Jul 2009
Location: Lansdale, PA
Posts: 3,106
UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.UNTAMND has a great reputation on FTE.
Engine can be running, but only idle with no vacuum, and set it to 39-41 for the factory spec. With vacuum connected it will lower the pressure.

Why did you add this regulator.
I have used an adjustable regulator to help a lean condition in the upper rpm range of my 460. Mine just liked the extra fuel.
__________________
JR Strout..aim UNTAMND..00psd4x4ccsbLariet37sTwinTurbo
http://www.youtube.com/profile?user=untamnd#g/u
90 F150 xlt lariat supercab 4x4 long bed 5.8 auto red interior (stock for now) 61000miles
67 Mustang GTA Fastback 390 UNTAMND.com
Reply With Quote
Old 01-01-2014, 08:53 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Intermittent Power loss/ Bogging SomeDude451 1987 - 1996 F150 & Larger F-Series Trucks 2 09-01-2014 10:16 PM
FPR and fuel pump question Fordenthusiasts 1987 - 1996 F150 & Larger F-Series Trucks 8 07-04-2011 08:32 PM
Starving for fuel!!! 86F1502WD 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 2 02-16-2011 10:46 PM
Weird fuel pressure problem 1989 F250 5.8L TexasWren 1987 - 1996 F150 & Larger F-Series Trucks 3 07-19-2010 02:40 PM
Help with codes 41 and 81 clark714x4 1987 - 1996 F150 & Larger F-Series Trucks 11 10-23-2004 10:34 PM


Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 07:17 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup