Fuel mods? - Diesel Forum - TheDieselStop.com
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 02-27-2005, 11:05 PM Thread Starter
Senior Member
FLpowerstroke's Avatar
Join Date: Feb 2005
Location: Cape Coral, FL
Posts: 183
My Photos: (11)
Feedback Score: 0 reviews
Fuel mods?

I appoligize in advance if this is a dumb question, but what are all these fuel system mods commonly referred to on this site? ( in tank, pre-pump, regulator mods, etc). What are the benefits? As always, thanks in advance!


2013 F250 Crew Cab Lariat, FX4, 6.7L

2006 F250 6.0L 4x4 Crew Cab XLT - Rims & Tires but otherwise pretty much all Stock! - SOLD

Early 99 F250 PSD 4x4 Born 03/98, Superchips programmer,warn manual hubs, straight thru exhaust, AIS intake system w/fender foam piece, Autometer full pillar cluster,Euro headlights, In-tank pre-pump & vent tube mods, 3" Trailmaster level kit, fabtech adj track bar, Skyjacker Dual Steering Stabilizers, Rhinoliner, 35" Pro Comp A/T on 17 x 10 Ultras, ART rotors & PF pads w/ATE blue DOT 4,Brand new 4R100 Tranny & 2 coolers w/mobil 1, A/C mod from dieselsite, coolant filter kit from dieselsite, boost tube & over boost valve from black cloud, Redhead Steering Gear - SOLD
FLpowerstroke is offline  
Sponsored Links
post #2 of 4 (permalink) Old 02-28-2005, 01:24 AM
Senior Member
Join Date: Aug 2001
Location: Saskatoon, SK
Posts: 4,348
My Photos: (1)
Feedback Score: 0 reviews
Re: Fuel mods?

All fuel contains air. Once it is in the fuel system, it does not want to end up in an injector. The Ford fuel system dead-ends in the cylinder heads, so any air in there has no place to go BUT the injectors. This is the cause of any number of problems: cackle & knock, worn injector bores, burned nozzle tips.

One of the sources of air is the push-on fittings that Ford uses to connect the fuel pump to the fuel line to the fuel tank. They sometimes will leak fuel out, but in many (maybe most) trucks, they leak air inward on the suction side of the fuel pump - putting it in the system. The fuel pickup assembly has a bunch of places where air can be introduced as well.

The stock fuel system regulates the temperature and pressure of the fuel at the fuel filter bowl on the engine. It is supposed to let air out at the regulator (located higher than the feed line) and return it to the tank. On many trucks, the total leakage overwhelms the system, and it gets by the filter and goes into the cylinder heads.

There are several things in the cylinder head that can also liberate air that is dissolved in the fuel. Again, once it is in there, it will end up in an injector. The "reg mod" re-routes the fuel to flow like an earlier 444E Navistar (what this engine is), in the low end of the head, out the high end and to a regulator to control pressure and back to the tank.

To go one step further, you can get a system (Air Dog) that removes much of the dissolved air from the fuel stream before it even hits the Ford lift pump.

All of the above are available from site sponsors. Search the archives, and you can read for about a month on these topics.

Hope that helps

Pat Dolan is offline  
post #3 of 4 (permalink) Old 02-28-2005, 06:32 AM
Senior Member
fordmastertech's Avatar
Join Date: Jul 2004
Location: Burlington CT.
Posts: 3,327
My Photos: (4)
Feedback Score: 0 reviews
Re: Fuel mods?

To go one step further, you can get a system (Air Dog) that removes much of the dissolved air from the fuel stream before it even hits the Ford lift pump.

[/ QUOTE ]
I second this suggestion. [img]/ubbthreads/images/graemlins/smokin.gif[/img]

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2000 Excursion Limited 4x4 Dark Satin Green Arizona Beige 7.3 DIT, AXDO, 3.73 LS, DP Tuner F5, TERMINATOR II w R-IPR, Adjustable Boost Regulator, Turbomaster, EBPV Delete, Air Dog, ITP Regulated Fuel Return, Fuel Cooler, Tags 1&2, Harpooned Tank, Magnaflow XL Exhaust w Aeroturbine 4040L, Sonnax/Tricumulator, 8 Autometer Sport Comp 4 Gauge A Pillar 4 Gauge Overhead, Ford APCM, Crimestopper Remote Starter With Remote Fast Idle, Ford AIS w Zoodad, W Code Front Modified B Code Rear springs, Rancho RS9000X, Rancho 5406 Stabilizer, Hellwig Rear Sway Bar, BFG Rugged Trail TA, V10 Trans Cooler w Dual Electric Pusher Fans, Coolant Filter, IAH Delete, (((XM))) Line Of Fire Light, Ford Cab Lights, 05 Headlights w GOS Conversion Harness, Jimmi Jammers, 03 Lighted Painted Tow Mirrors w C-BETR, PSD Badges, Pullrite Hitch, Prodigy Brake Controller, Born 01/29/00
fordmastertech is offline  
Sponsored Links
post #4 of 4 (permalink) Old 02-28-2005, 06:59 AM
Senior Member
Join Date: Oct 1999
Location: Fairfax, VA
Posts: 471
My Photos: (0)
Feedback Score: 0 reviews
Re: Fuel mods?

PD speaks the truth..

I changed the fuel pump goesinta fitting.. things quieted down.. I run on my aux tank, bypassing factory tank & pickup, things get even quieter..

Y2K F-350-XLT-SC-Shortie-6sp-4X4-Silver/Gray...

Sandman is offline  
Sponsored Links

  Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > '99 & up Upgrades and Aftermarket - 7.3L Engine

Quick Reply

Register Now

In order to be able to post messages on the Diesel Forum - TheDieselStop.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
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