PureFlow Airdog FPII-125 User manual

INDUSTRIAL
Fuel Air Separation System
PROTECTED UNDER THE FOLLOWING PATENTS
CANADA UNITED STATES OF AMERICA MEXICO
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NEW ZEALAND ITALY AUSTRALIA HONG KONG ECUADOR
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Additional Foreign Patents Issued and Pending in Europe, South America, Japan, and China
INSTALLATION MANUAL
UNIVERSAL DIESEL ENGINE APPLICATIONS
AIRDOG
®
FPII-125
NOW WITH DEMAND FLOW
Providing “Test Cell Performance” in “Real World Conditions” Since 1993
Proudly Made in the USA
www.airdogdiesel.com
1-573-635-0555 or
1-877-463-4373
Revised 6/22/2021

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THE RIGHT CHOICE FOR YOUR DIESEL ENGINE
INDUSTRIAL
Fuel Air Separation System
SMALL and COMPACT
7” Long x 3.2” Wide x 10” Tall

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SYSTEM OVERVIEW
Welcome to the AirDog®Heavy Duty FPII-125
Fuel Air Separation System
The AirDog® FPII-125 with ADVANCED FUEL AIR SEPARATION, DEMAND FLOW,
ADJUSTABLE REGULATOR, LOW PRESSURE SENSOR with LED INDICATOR LIGHT
and the 4G-HD FUEL PUMP, is a premium fuel ltration and delivery system for the diesel
engine.
The AirDog®FPII-125 removes water, particulates and the air that becomes entrained in diesel
fuel from sloshing and agitation from the fuel ow to the engine. The entrained air and vapor
separated from the fuel is returned to the fuel tank through a small return line. The fuel ow
to the engine’s transfer pump is at a NET POSITIVE PRESSURE HEAD preventing cavitation
and the formation of vapor thus overcoming the performance related problems from plugged
fuel lters, high altitude operation and torque loss at higher engine RPM’s.
Air and vapor are compressible. When Air/Vapor is present in a fuel injection system, the
pressure buildup and injection of fuel is delayed while the air/vapor is being compressed.
This delays the injection timing causing a shorter power stroke and low power, increased fuel
consumption and increased exhaust emissions. Preventing the formation of vapor from pump
cavitation and removing entrained air from the fuel ow to the injectors restores Correct
Injection Timing. Diesel engines equipped with the AirDog®can now perform as designed,
delivering “test cell” performance while in “real world” use!
All AirDog®products are manufactured with a personal touch,
unsurpassed attention to detail and the most stringent quality assurance.
TYPICAL INSTALLATION LAYOUT
The AirDog® FPII-125 returns entrained air and vapor (foam) with very little fuel ow back to the
tank and requires only one small return line to only one tank for quick and easy installations.
Positive Fuel
Pressure to
Transfer Pump
Air/Vapor Return Line
Fuel Supply Line
Entrained Air in Fuel
from Agitation & Sloshing
Transfer Pump
Fuel Preporator®

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PureFlow®Technologies, Inc.
AirDog®FPII-125 Universal Applications
QUICK CONNECT COMPONENT OVERVIEW
Provided in this kit is an OE style quick connection system. This system works to allow for
a quick, clean, and professional install.
SAE J2044 Quick Connect System
The SAE J2044 quick connect system is the most commonly used system in the automotive
industry. The images below show the formation of the SAE J2044 connection. To connect
the assemblies, simply insert the male end form into the mating female connector. Push
rmly until you hear it “click” into place. To disconnect the ttings, press down and hold
the tabs on the female connector while you rmly pull the assembly apart.

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PureFlow®Technologies, Inc.
AirDog®FPII-125 Universal Applications
TABLE OF CONTENTS
Section 1……..….….…...........……................................…...…….....Table of Contents
Section 2…….........….…………………....................Installation and Safety Guidelines
Section 3……..……...…..……….….…..............….…………………...….….Parts List
INSTALLATION PROCEDURES
Section 4…....…...........................................................Fittings, Brackets, and Mounting
Section 5……..…...…..................................................................………........Fuel Lines
Section 6….....……....................…..……....………….….…………......Wire Harness
Section 7..…….................….…..….................…….........……Initial Start Up Procedure
MAINTENANCE
Section 8.………..........................................…………Filter Service Recommendations
Section 1 Table of Contents

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PureFlow®Technologies, Inc.
AirDog®FPII-125 Universal Applications
INSTALLATION GUIDELINES
The installation of your AirDog® FPII-125 can be made relatively easy by following the steps
outlined in this manual, and:
1. Inventory the package components. Immediately notify PureFlow®Technologies, Inc.
of any missing or damaged parts.
2. Read the installation manual completely. Understand how the system operates and the
installation recommendations before beginning.
3. Proper location of the AirDog®FPII-125 on the vehicle is essential. Consider hazards
presented to the equipment by road debris and the elements.
4. The installation recommendations and guidelines contained herein are suggestions only.
Individual installations may vary.
5. Use diesel compatible thread sealer when installing ttings with NPT threads.
(Loctite® 545 Thread Sealer is diesel compatible)
SAFETY GUIDELINES
CAUTION: Chock the vehicle’s tires to prevent rolling.
CAUTION: Disconnect the battery cables before proceeding with the AirDog®installation.
CAUTION: Wear safety glasses when operating power tools, such as drills and grinders, or when
using a punch or chisel.
CAUTION: Do not drill into or weld the top of the frame rail or within 1-½” of the frame rail
ange on the side of the frame rail.
CAUTION: Route the fuel lines and electrical harnesses keeping them away from hot exhaust
components and/or moving parts. Properly secure the fuel lines and electrical
harnesses to prevent chang using zip ties included in installation kit.
CAUTION: Do not subject the AirDog® system directly to high-pressure wash systems. Doing so
may damage seals and electrical components, and such damage is NOT covered under
warranty.
If you are uncertain of any installation procedure, please call PureFlow®
Technologies, Inc. at 877-463-4373 for technical assistance.
NOTE: The pictures used in this manual are for example only and may not
depict the exact components as found on your vehicle.
Section 2 Installation & Safety Guidelines

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PureFlow®Technologies, Inc.
AirDog®FPII-125 Universal Applications
Installation Parts List
Section 3 Parts List
1 AirDog® FPII-125 FPII-125
1 AirDog®FPII-125 Bracket 001-3C-0004-PC
1 Frame Brackets 010-3C-0002PC
1 Wire Harness with Indicator Light 5E-2-010
1 Indicator Light Dash Plate 201-3-0004-S-M
1 1/2” General Purpose Hose (Fuel Line) - 30 ft Section 4C-1-02-08-004-030
QTY Description Part Number Image
010-3C-0001PC
1 3/8 ID 7/8 OD Rubber Grommet 5J-1-1-04-2758
2 1/2 F 90° Hose Quick Connect Fitting 4A-9-FQC1290
2
1/2 F Straight Hose Quick Connect Fitting 4A-9-FQC12S
1 3/8 F 90° Hose Quick Connect Fitting 4A-9-FQC3890
2 1/2 M J2044 Quick Connect x 9/16 UNF 4A-9-08J2044916UNF
1 3/8 M J2044 Quick Connect x 5/16 UNF 4A-9-06J2044516UNF
3 #8F JICX x 1/2 Push-lock Hose Barb 4A-1-09-08-08-B
2 #8M JIC x 3/8 M ORB Straight Connector 4A-1-01-08-06-S
1 3/8-18 M NPTF x 3/8-18 F NPTF x 3/8-18 F NPTF Tee 4A-4-01-06-S
1 #8M JIC x 3/8 M NPTF Straight Connector 4A-1-02-08-06-SZ
908-01-0460-QC Fitting Kit
ADFK-460 Installation Kit
1 Fuel Pressure Sensor 908-5C-9-007 or
908-5C-9-0010
1
Spacer 010-3C-0003A-P
1 Zip Tie Bundle 5H-2-1-06/12B
1 Mounting Hardware Kit Includes: 901-61-0125
(1) Nut Packet 908-61-0125-N
(1) Washer Packet 908-61-0125-W
1/4-20 x 1-1/4 SHCS (4) 1L-A20SZ
5/16-18 x 2-3/4 FHSCS (4) 1M-B44SZ
3/8-16 x 4-1/2 HHCS (3) 1J-1-C72SZ
Fuel Filter FF100-2
Water Separator WS100

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PureFlow®Technologies, Inc.
AirDog®FPII-125 Universal Applications
Illustration of Quick Connect Components
Section 4 Fittings, Brackets, and Mounting

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PureFlow®Technologies, Inc.
AirDog®FPII-125 Universal Applications
Installing the J2044 Quick Connect Fittings & Pressure Sensor
into the AirDog®FPII-125 Filter Base
Section 4 Fittings, Brackets, and Mounting
4-1. Dip the threaded end of the 1/2” M J2044 quick connect x 9/16” UNF
(4A-9-08J2044916UNF) ttings into clean motor oil and hand-thread into the “ENGINE”and
“FUEL IN” ports of the AirDog® FPII-125 lter base as illustrated in Figures 1, 2, and 3.
Using a 3/4” deep socket, torque the ttings to 120in-lb or 10ft-lb. Do NOT overtighten
the ttings or damage may occur.
4-2. Dip the threaded end of the 3/8” M J2044 quick connect x 5/16” UNF
(4A-9-06J2044516UNF) tting into clean motor oil and hand-thread into the return port of the
AirDog® FPII-125 lter base as illustrated in Figures 1 and 4. Using a 5/8” deep socket, torque the
tting to 60in-lb or 5ft-lb. Do NOT overtighten the ttings or damage may occur.
4-3. Remove the 1/8” NPT plug in the 45° elbow. Install the pressure sensor into the elbow.
Figure 1 Figure 2 Figure 3
RETURN
ENGINE FUEL IN
RETURN
ENGINE
Figure 4

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PureFlow®Technologies, Inc.
AirDog®FPII-125 Universal Applications
Section 4 Fittings, Brackets, and Mounting
4-4. Assemble the AirDog®mounting bracket (PN 001-3C-0004-PC) to the frame bracket (PN
010-3C-0001PC) using the spacer (PN 010-3C-0003A-P) as shown in Figure 5 using the four bolts,
lock washers, and nuts included in the mounting bracket hardware kit (PN 901-61-0125) shown
in Figure 6. Properly torque all fasteners. You will need a 3/16” allen and a 1/2” wrench. The bracket
assembly should look like Figure 7.
4-5. Attach the AirDog® FPII-125 to the frame bracket assembly as shown in Figure 8 using the
supplied hardware in the mounting bracket hardware kit.
4-6. Be sure to tuck the AirDog® FPII-125 as far up as possible without it rubbing on anything to
prevent damage from road debris. The bracket assembly is adjustable to achieve this.
NOTE: We recommend installing the AirDog® on the inside of the frame rail, but we understand some
applications don’t have room. The photos in this manual may not be the same as your application.
Figure 8
Figure 5 Figure 6 Figure 7