How non-regulated return fuel system works - Ford Powerstroke Diesel Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 12 Old 08-09-2013, 08:16 AM Thread Starter
Chapter Director

 
Rammstein1224's Avatar
 
Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,931
Thanks: 4
Thanked 45 Times in 37 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 5 reviews
How non-regulated return fuel system works

I have been reading alot lately about SD 7.3s and 6.0s going to regulated return, well after my diy e-fuel on my OBS i have a moderate understanding of how the fuel system works but what i dont get is how you can NOT have regulated return. Wont the system keep building pressure without a return to the tank? Or do the injectors eat all the fuel or does the fuel pump get shut off when pressure builds?

Am i just ignorant or something? Someone please explaine the difference in regulated return vs non regulated return.

Local Jackass member Pat

Battle cry of every 6.0 owner out there
Quote:
Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
E-fuel Conversion
West Coast mirrors
Rammstein1224 is offline  
post #2 of 12 Old 08-09-2013, 08:34 AM
Compression Ignition Addict

 
RollinEarly99's Avatar
 
Join Date: May 2008
Location: Klamath Falls
Posts: 3,379
Thanks: 30
Thanked 25 Times in 24 Posts
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Feedback Score: 10 reviews
Regulated return means that the fuel pressure is regulated on the return line... Some guys choose to regulate their fuel pressure before the injectors. All of our trucks still have fuel regulators in them... Ever heard of the blue spring mod on 6.0's?

05 F-250 Crew Cab Short Bed
ARPs w/OEM Gaskets
MTW Stage 2 w/batmowheel
BPD oil cooler w/ cold weather package
BPD Updated umm...Everything
BPD bypass oil filter
BPD FICM 58v
Spring Mod
Egr deleted
4" Duals
Edge CTS
Custom grille made by Me
X3 w/Matts SRL+/SRLxx and Tow Tunes
Tony WildmanExtreme w/early lockup



RollinEarly99 is offline  
post #3 of 12 Old 08-09-2013, 08:39 AM Thread Starter
Chapter Director

 
Rammstein1224's Avatar
 
Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,931
Thanks: 4
Thanked 45 Times in 37 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 5 reviews
Ahh i see that makes sense i thought the "return" in regulated return was referring to its returning fuel to the tank in general. What are the advantages of regulating before or after the injectors?

Local Jackass member Pat

Battle cry of every 6.0 owner out there
Quote:
Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
E-fuel Conversion
West Coast mirrors
Rammstein1224 is offline  
post #4 of 12 Old 08-09-2013, 08:40 AM
Compression Ignition Addict

 
RollinEarly99's Avatar
 
Join Date: May 2008
Location: Klamath Falls
Posts: 3,379
Thanks: 30
Thanked 25 Times in 24 Posts
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Feedback Score: 10 reviews
Non regulated return just sends the extra fuel back to the tank right where its regulated(before the injectors). Only problem is the fuel going back to the tank isn't coming out of the back of the heads so there is a potential that the injectors in the back have a chance of being starved... Plus all air in the fuel system is forced into the heads and gets trapped at the end of the line and has nowhere to go but out thru the injectors. I'm sure someone else will chime in shortly and correct me if I'm wrong plus give more detail into the factory fuel system. I haven't taken mine apart yet but do plan on doing the DIY RR myself.

05 F-250 Crew Cab Short Bed
ARPs w/OEM Gaskets
MTW Stage 2 w/batmowheel
BPD oil cooler w/ cold weather package
BPD Updated umm...Everything
BPD bypass oil filter
BPD FICM 58v
Spring Mod
Egr deleted
4" Duals
Edge CTS
Custom grille made by Me
X3 w/Matts SRL+/SRLxx and Tow Tunes
Tony WildmanExtreme w/early lockup



RollinEarly99 is offline  
post #5 of 12 Old 08-09-2013, 08:43 AM Thread Starter
Chapter Director

 
Rammstein1224's Avatar
 
Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,931
Thanks: 4
Thanked 45 Times in 37 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 5 reviews
So in order to do a regulated return the heads would have to be drilled/tapped in the back to allow the flow to run straight through?

Local Jackass member Pat

Battle cry of every 6.0 owner out there
Quote:
Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
E-fuel Conversion
West Coast mirrors
Rammstein1224 is offline  
post #6 of 12 Old 08-09-2013, 08:44 AM
Compression Ignition Addict

 
RollinEarly99's Avatar
 
Join Date: May 2008
Location: Klamath Falls
Posts: 3,379
Thanks: 30
Thanked 25 Times in 24 Posts
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Feedback Score: 10 reviews
Quote:
Originally Posted by Rammstein1224 View Post
Ahh i see that makes sense i thought the "return" in regulated return was referring to its returning fuel to the tank in general. What are the advantages of regulating before or after the injectors?
I'm pretty sure that fuel regulated after the injectors allows for more fuel when the injectors are at WOT. If you regulate fuel to say 60 psi and then feed 8 injectors there will be a drop in psi. But if fuel is regulated after the injectors the fuel pump does a better job of keeping fuel pressure up while at WOT.

05 F-250 Crew Cab Short Bed
ARPs w/OEM Gaskets
MTW Stage 2 w/batmowheel
BPD oil cooler w/ cold weather package
BPD Updated umm...Everything
BPD bypass oil filter
BPD FICM 58v
Spring Mod
Egr deleted
4" Duals
Edge CTS
Custom grille made by Me
X3 w/Matts SRL+/SRLxx and Tow Tunes
Tony WildmanExtreme w/early lockup



RollinEarly99 is offline  
post #7 of 12 Old 08-09-2013, 08:46 AM
Compression Ignition Addict

 
RollinEarly99's Avatar
 
Join Date: May 2008
Location: Klamath Falls
Posts: 3,379
Thanks: 30
Thanked 25 Times in 24 Posts
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Feedback Score: 10 reviews
Quote:
Originally Posted by Rammstein1224 View Post
So in order to do a regulated return the heads would have to be drilled/tapped in the back to allow the flow to run straight through?
There is ports on the back of the heads that are just plugged and adding a banjo bolt (or 90* fitting) is all that's needed to get the fuel coming out the back side of the head.

05 F-250 Crew Cab Short Bed
ARPs w/OEM Gaskets
MTW Stage 2 w/batmowheel
BPD oil cooler w/ cold weather package
BPD Updated umm...Everything
BPD bypass oil filter
BPD FICM 58v
Spring Mod
Egr deleted
4" Duals
Edge CTS
Custom grille made by Me
X3 w/Matts SRL+/SRLxx and Tow Tunes
Tony WildmanExtreme w/early lockup



RollinEarly99 is offline  
post #8 of 12 Old 08-09-2013, 08:49 AM Thread Starter
Chapter Director

 
Rammstein1224's Avatar
 
Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,931
Thanks: 4
Thanked 45 Times in 37 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 5 reviews
Quote:
Originally Posted by RollinEarly99 View Post
I'm pretty sure that fuel regulated after the injectors allows for more fuel when the injectors are at WOT. If you regulate fuel to say 60 psi and then feed 8 injectors there will be a drop in psi. But if fuel is regulated after the injectors the fuel pump does a better job of keeping fuel pressure up while at WOT.
Yea thats what i would imagine in my head makes more sense, any idea why ford decided to do this in the SD vs the OBS that has regulated return stock? Cheaper?

Quote:
Originally Posted by RollinEarly99 View Post
There is ports on the back of the heads that are just plugged and adding a banjo bolt (or 90* fitting) is all that's needed to get the fuel coming out the back side of the head.
Ok i see id imagine its the same on the 7.3 because i think the heads between the OBS and the SD are the same and the OBS has the ports

Local Jackass member Pat

Battle cry of every 6.0 owner out there
Quote:
Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
E-fuel Conversion
West Coast mirrors
Rammstein1224 is offline  
post #9 of 12 Old 08-09-2013, 01:17 PM
Compression Ignition Addict
 
Join Date: Dec 2007
Posts: 6,223
Thanks: 7
Thanked 235 Times in 226 Posts
Mentioned: 6 Post(s)
Quoted: 82 Post(s)
Feedback Score: 3 reviews
Go to RiffRaff and take a look at their FrX. It's a great alternative to a full-blown RR and accomplishes the same thing for Much less $$ (especially on a Stock Engine)
NoRalPh is online now  
post #10 of 12 Old 08-09-2013, 01:24 PM Thread Starter
Chapter Director

 
Rammstein1224's Avatar
 
Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,931
Thanks: 4
Thanked 45 Times in 37 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 5 reviews
Quote:
Originally Posted by NoRalPh View Post
Go to RiffRaff and take a look at their FrX. It's a great alternative to a full-blown RR and accomplishes the same thing for Much less $$ (especially on a Stock Engine)
Hell for 180 i could buy a fpr and some frame mounted filters and do a fuel bowl delete all together like i did for my OBS

Local Jackass member Pat

Battle cry of every 6.0 owner out there
Quote:
Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
E-fuel Conversion
West Coast mirrors
Rammstein1224 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