Let's Fix Your Diesel Today!

Call Now  715-254-2307

Owner, Gary Nilsen, will answer your diesel parts question when you call.

AirDog II 4G (DF165) Air Dog II Fuel System Fuel Air Separator 89-93 Dodge Cummins 5.9L

$885.00 $799.00
(You save $86.00)
(No reviews yet) Write a Review
Calculated at Checkout
AirDog II 4G (DF165) Air Dog II Fuel System Fuel Air Separator 89-93 Dodge Cummins 5.9L

NOTE: Questions, Call 715-254-2307

AirDog II-4G (DF165): 1989-1993 Dodge Cummins 5.9L

165 GPH Preset


NEW Quick Connect for Faster Installation 
Increased Fuel Economy and Performance

Air Dog II Fuel System Fuel Air Separator from Pure Flow Diesel Improves Fuel Economy and Mileage, Optimizes Engine Performance, Provides Longer Injector Life, Improves Throttle Response, Removes Air from Fuel Lines Resulting in Quieter Running Engine!
From the makers of the Original Air Dog Fuel Air Separation System.
This patented fuel system efficiently removes air/vapor from your
diesel fuel for improved fuel economy and performance.

• removes air/vapor from diesel fuel
• allows pure diesel fuel to reach engine
• creates high flow rates of fuel to engine
• promotes longer injector life
• increases fuel economy
• optimizes engine performance
• increases torque output
• improves throttle response
• removing air from fuel lines results in quieter running engine
• averages 4 db sound reduction!
Small & Compact: ONLY 7”L X 10”T X 3.2”W
Dual Feed Gerotor Pump: Quiet, Efficient,
Long Lasting!

AirDog ® II Fuel Air Separation System featuring Demand Flow Technology

AirDog ® II is designed to operate at flows and pressures beyond the maximum requirements of the engine. It receives fuel under vacuum from the fuel tank containing entrained air/vapor, particulate contaminates and unknown quantities of water.

The fuel passes through the water separator which removes the large particulate contaminates that could damage or jam the gerotor fuel pump. The fuel, with only entrained air/vapor and tiny particulate contaminates remaining, then enters the fuel pump.

The fuel, now under positive pressure flow, enters the fuel filter. As the fuel passes through the filter media and the remaining particulate contaminates are caught and contained, the entrained air/vapor is also separated. Through the positive fuel air separation features of the patented AirDog ® II the separated air/vapor is discharged from the filter and back to the fuel tank through the Primary Air/Vapor Discharge Port.

The fuel passing through the filter media is now free of contaminates and power robbing air/vapor. At pressures and flows able to meet the needs of the engine, it exits the fuel filter through two passageways. First, the fuel for the engine, passes into the fuel pickup tube and on to the engine. Then, the excess fuel not needed by the engine recycles internally through the pressure regulator back to the water separator.