AIRDOG II-4G A6SABD425 DF-165-4G 1998.5 to 2004 Dodge Cummins Air Fuel Separation System

In Stock & Ready to Ship


AirDog A6SABD425

AirDog II 4G 1998.5 to 2004 DODGE Cummins 165 GPH @ 8 PSI - A6SABD425  

The PureFlow AirDog II-4G A6SABD425 DF-165-4G Air/Fuel Separation System is designed for use on the 1998.5 to 2004 DODGE vehicles equipped with the 24V 5.9L Cummins diesel engine that has the in-tank fuel pump. The PureFlow AirDog II-4G is the next generation in lift pump fuel delivery. The compact AirDog II-4G fuel air separation system provides increased engine performance as a long-lasting, efficient quiet lift pump. The compact AirDog II-4G provides the most effective technology designed specifically designed for the effective removal of water, suspended particulates, vapor, and entrained air from diesel fuel.

The AirDog lift pump returns the fuel Air/Vapor back to the tank through a filler neck tee. This PureFlow AirDog II-4G A6SABD425 lift pump system is sold as a complete kit with all required parts for a straightforward installation. This is a 165 Gallon Per Hour fuel system for moderately modified trucks between five hundred and eight hundred Horsepower. 

KLM Performance is an Authorized AirDog Dealer, and we STRONGLY RECOMMEND that before you begin the installation of your AIRDOG II-4G A6SABD425  DF-165-4G Fuel System you complete the registration of the Lifetime PureFlow AirDog Warranty online at

NOTE: This is a High flow and low-pressure diesel fuel lift pump that requires an unrestricted flow of diesel fuel to the lift pump. It is suggested for this higher performance Lift Pump that you upgrade your pump fuel supply with a Fuel Sump or The AirDog Suction Tube Kit - 901-01-0351-QC kit allows for a larger volume of diesel fuel to be retrieved by the fuel pump. This is important for high-performance Dodge Cummins applications that demand a large amount of diesel fuel for aggressive fueling upgrades.

The PureFlow AirDog DF-165-4G Air-Fuel Separation System Lift Pump is designed for direct installation on the following 5.9l Cummins Diesel Engines:

  • 1998.5 Dodge Ram 2500 and 3500 series trucks with the 5.9L 24 Valve Cummins.
  • 1999 Dodge Ram 2500 and 3500 series trucks with the 5.9L 24 Valve Cummins.
  • 2000 Dodge Ram 2500 and 3500 series trucks with the 5.9L 24 Valve Cummins.
  • 2001 Dodge Ram 2500 and 3500 series trucks with the 5.9L 24 Valve Cummins.
  • 2002 Dodge Ram 2500 and 3500 series trucks with the 5.9L 24 Valve Cummins.
  • 2003 Dodge Ram 2500 and 3500 series trucks with the 5.9L 24 Valve Cummins
  • 2004 Dodge Ram 2500 and 3500 series trucks with the 5.9L 24 Valve Cummins

 The AirDog DF-165-4G Air-Fuel Separation System Lift Pump Applications:

  • 1998.5 to 2004 Dodge Ram 2500 with 5.9L 24 Valve Cummins that has the in-tank fuel pump. 
  • 1998.5 to 2004 Dodge Ram 3500 with 5.9L 24 Valve Cummins that has the in-tank fuel pump. 

The AirDog II 4G Series Lift Pump is the latest version of the high-performance diesel fuel lift pumps.  It incorporates the latest features and fuel pump improvements. This AirDog II 4G 1998.5 to 2004 DODGE Cummins 165 GPH @ 8 PSI A6SABD425 diesel fuel system is the top-performing, longest lasting and most reliable aftermarket diesel fuel filtration system available. 

The AirDog DODGE Cummins Air Fuel Separation System for the 1998.5 to 2004 Cummins 24 Valve 5.9L provides the purified fuel, correct fuel pressure, and delivery volume to ensure the optimal engine operation and long, trouble-free life of your entire fuel injection system. 

  • New Bolt-On Frame Bracket Installation
  • Preset 8 to 10 PSI Fuel Pressure
  • Complete Replacement Pump
  • 165 Gallons Per Hour Flow Rating
  • An adjustable regulator provides a means to fine-tune the system for performance upgrades.
  • Removes Water, Air, and Debris From Diesel Fuel
  • 2 Micron Filtration Rating
  • Protects and Extends The Life Of Your Fuel Injectors and Fuel Injection System
  • Improved Cold Weather Starts
  • Decreases Carbon Monoxide and Carbon Dioxide Emissions by providing increased levels of fuel combustion.
  • ½ Inch Fuel Lines and Ports with the SAE J2044 Quick Connect System simplifies installation.
  • The AirDog® II DF-165 is recommended for highly modified Cummins Diesels.
  • The AirDog® II DF-165 offers a compact size of 7” Long X 3.2” Wide X 10” Tall.
  • Fuel Mileage Improvement
  • Improved Fuel Volume Delivery
  • Smoother Engine Idle
  • Limited Lifetime Warranty
  • 30,000 Mile Filter Life Expectancy
  • Quietest Motor On The Market


NOTE: AIRDOG II-4G A6SABD425 DF-165-4G AIR-FUEL SEPARATION SYSTEM is approved for sale in California with a CARB E.O. number on file with the California Air Resources Board. 

The PureFlow® AirDog® DF-165 Fuel Air Separation Fuel Air Separation Systems for the Dodge Cummins Trucks with the 5.9L Cummins Diesel Engines are MADE IN THE USA!

  • Engine: 5.9L Cummins
  • Flow Rate: One Hundred Sixty-Five Gallons Per Hour
  • Fuel Delivery Pressure:  8 to 10 PSI.
  • Power Level: Stock to Five Hundred Horsepower
  • Make: Dodge Ram | Cummins
  • Model: Dodge Ram 2500 | Dodge Ram 3500
  • Year: 1998.5 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004
  • Manufacturer Part No: A6SABD425
  • Product Application: 1998.5 to 2004 Dodge Ram trucks that have the in-tank fuel pump.  Cummins 24V diesel trucks 5.9L Cummins engines.
  • FAQ:  Why do I need to install an Aftermarket Lift Pump on my Cummins diesel engine? If you want to increase the performance or power level of your Cummins diesel engine you will need to ensure you obtain the proper flow of purified diesel fuel. Today is very simple to just add aftermarket performance parts to obtain more power. One of the primary principles to obtain increased power is the ability to provide more fuel at the proper pressure and delivery rates. This is where the PureFlow AirDog-II 4G Series Lift Pump comes in. The diesel engine holds the top spot for the most efficient internal combustion over all other engine types, adding a new diesel fuel pump to your diesel engine can vastly increase its performance output level. What does the PureFlow AirDog II-4G Pump do? The AirDog® II draws fuel from the fuel tank, removing water, particulates, and air/vapor. The fuel supplied to the Injection Pump is now purified and pressurized with a regulated flow based upon the demand placed upon your Cummins engine. 
  • Part Number: A6SABD425
  • Manufacturer: PUREFLOW AIRDOG
  • Product Note: This is a high-flow, low-pressure fuel air separation system which allows you to bypass the OEM fuel filter bowl and supply purified fuel directly to the fuel injection pump on your 5.9L 24v Cummins that has the in-tank fuel pump. 


            The Pureflow AirDog Limited Lifetime Warranty Coverage Applies to these products:

            PureFlow AirDog Lift Pump Systems

            PureFlow AirDog II-4G Lift Pump Systems

            PureFlow AirDog Raptor-4G System

            PureFlow AirDog FRRP Systems have a 4 Year Warranty







            PureFlow AirDog (hereafter collectively, "SELLER") warrants and guarantees only to the Original Purchaser (hereafter collectively, BUYER) that All PureFlow AirDog Systems (hereafter collectively, PRODUCT) shall be free from defects of materials and workmanship in the manufacturing process for as long as the BUYER owns the PRODUCT.

            The Lifetime Limited Express Warranty is limited to the PRODUCT purchased by the PRODUCT's original BUYER and limited solely to the parts contained within the PRODUCT and EXCLUDES ALL ELSE INCLUDING FILTERS AND WATER SEPARATORS. Any PRODUCT in the Warranty's question must be returned, shipped prepaid, to PureFlow AirDog. All Warranty claims are subject to the approval of PureFlow AirDog. If it is determined that a Warranty claim exists, PureFlow AirDog will, at its sole discretion, replace the defective PRODUCT with a comparable PRODUCT, repair the defective PRODUCT, or refund the BUYER'S purchase price in exchange for the PRODUCT. Repairs or replacements are warranted for only the remainder of the original warranty period and only to the original BUYER.


            Under no circumstances shall the SELLER be liable for any labor charged or travel time incurred in the diagnosis for defects, removal, or reinstallation of the PRODUCT, or any contingent expense.

            Under no circumstances will the SELLER be liable for any damage or expense incurred by reason for using or selling the PRODUCT.

            Other than expressly set forth herein, the SELLER shall in no way be responsible for the proper or improper use and service of the PRODUCT. In no event shall the SELLER be liable for any special, incidental, indirect, or consequential damages of any kind or nature, whether or not the BUYER of the PRODUCT was advised of the possibility of injury or harm, arising or resulting from the use or performance of the PRODUCT and BUYER at this moment waives the right to any and or all such claims.

            BUYER, acknowledges that he/she is not relying on SELLER'S skill or judgment to select or furnish goods suitable for any particular purpose and that SELLER has no liability that will extend beyond the scope of the LIMITED EXPRESS WARRANTY contained herein, and BUYER at this moment waives all remedies or liabilities, expressed or implied, arising by operation of law or otherwise. (including, without limitation, any obligation of SELLER concerning fitness for any particular purpose;

            merchantability; and special, incidental, indirect, or consequential damages) or whether or not occasioned by SELLER'S negligence.

            SELLER disclaims any warranty and expressly disclaims any liability for personal inquiry or damages related to BUYER'S use of the PRODUCT. BUYER acknowledges and agrees that the disclaimer of any liability for personal injury is a material term for this agreement, and BUYER agrees to indemnify SELLER and hold SELLER harmless from any claim related to the PRODUCT and its use or performance. Under no circumstances will SELLER be liable for any damages, liabilities, costs, or expenses incurred as a result of or by reason of use, performance or sale of the PRODUCT, including without limitation, any damages,

            liabilities, costs or expenses incurred by reason of BUYER'S negligence related to those uses of the PRODUCT.

            The proper installation of the PRODUCT is the sole responsibility of the BUYER. The SELLER assumes no liability regarding improper installation or misapplication of the PRODUCT.

            SELLER hereby provides the following limited Warranty as to description, quality, merchantability, fitness for the PRODUCT'S purpose, productiveness, or any other matter of SELLER'S PRODUCT sold herewith. The SELLER shall be in no way responsible for the open use and service of the PRODUCT and the BUYER hereby waives all rights other than those expressly written herein. This Warranty shall not be extended or varied except by a written instrument signed by SELLER and BUYER.

   is an Authorized Reseller for the Manufacturer Pureflow AirDog. All Warranty registration and inquiries are completed through

            WARRANTY REGISTRATION: Click to Register

            WARRANTY PHONE NUMBER: 877-421-3187

            WARRANTY E-MAIL: