PureFlow Airdog FPII-125 User manual

INDUSTRIAL
Fuel Air Separation System
PROTECTED UNDER THE FOLLOWING PATENTS
CANADA UNITED STATES OF AMERICA MEXICO
2,108,391 5,355,860; 5,746,184; 6,729,310 270409
NEW ZEALAND ITALY AUSTRALIA HONG KONG ECUADOR
532356 1362177 2005101054 1061420 PL10-2021
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