AirDog II-4G DF-165 fits 2001-2015 Duramax

  • Increased Fuel Economy
  • Increased Power Output
  • Increased Torque Output
  • Longer Injector Life
  • Improved Throttle Response


Air Dog II-4G 165gph Fits: 01-15 Duramax
This 4th Generation Lift Pump is the QUIETEST PUMP to date.

Check out our blog post with dyno results: CLICK HERE to see our dyno graph and read the full report - AND Please watch the video at the bottom of this page to see exactly what is going on with your fuel.


Regular Price: $759.99

Special Price $739.00

Pureflow Airdog

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AirDog® II-4G

AirDog® II-4G Removes Entrained Air/Vapor From Diesel Fuel Improving Engine Performance

The next generation in the fuel delivery system.

The patented AirDog® II-4G has been quality engineered to remove entrained air and water vapor from diesel fuel. The result is a compact, long lasting, efficient, and quiet fuel system made with superior quality.

Advancing the AirDog® Tradition with the 4th Generation Fuel System!

The AirDog® II-4G system improves engine performance by:

  • Maintaining Correct Injection Timing

  • Eliminating Spray Pattern Disruption

  • Allowing for a Full Power Stroke and Complete Burn


Benefits of the AirDog® II-4G:

  • Increased Fuel Economy

  • Increased Power Output

  • Increased Torque Output

  • Longer Injector Life

  • Improved Throttle Response

  • Reduced Exhaust Emissions

  • Optimized Engine Performance

AirDog® II-4G also overcomes loss of power for diesel engines operating at higher altitudes.


AirDog® II-4G Features

AirDog® II-4G - Advanced Fuel/Air Separation Fuel Saving Benefits and Technology
  • Dual Feed Gerotor Pump

  • Low amperage motor provides efficiency and endurance

  • Self-aligning motor requires less maintenance and reduces noise levels

  • Intermediate pump shaft seperates motor from fuel

  • Small & Compact: ONLY 7″L X 10″T X 3.2″W


AirDog® II-4G Installation Kit

AirDog® II-4G - Fuel/Air Separation Installation Kit

All-Inclusive Installation Kit includes:

  • Relay Control Wiring Harness

  • Fuel Module Up-Grade (when required)

  • All Fuel Fittings Required

  • Mounting Hardware

  • 1/2″ Fuel Lines W/ OEM Style Quick Connect Fittings

  • AirDog® II-4G Bracket & Spacer

  • Plastic Ties

  • Installation Manual


AirDog® II-4G Fuel Air Separation System featuring Demand Flow Technology and Enhanced Features

AirDog® II-4G 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 gear rotor fuel pump. The fuel, with only entrained air/vapor and tiny particulate contaminates remaining 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-4G 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.

YouTube Video

Additional Info

Additional Info



Customer Reviews (3)

One of the best purchases I've made!Review by ATP Staff - Braydon
The new airdog ll-4G in my mind is the absolute best pump out on the market right now! The pump is super quiet but has awesome power gains, and with the quick connects on the fuel lines the install was crazy easy! i recommend this pump to everyone with a diesel truck simply because by just installing this pump on my 06 LBZ i gained and extra 30hp and the drivablility increase was amazing! (Posted on 5/27/2016)
Amazing Product Review by ATP Staff - Brandan Smith
The new Airdog 2 4G is definitely the lift pump of my choice and is what i have on my personal truck. With the adjustable regulator on the outside of the unit along with it mounting on the inside of the frame rail rather than the outside like other pumps really sold me on it! The new 4G upgraded pump is extremely quiet with no humming noises of any kind! Definitely the lift pump to go with when it comes to any model of truck! (Posted on 4/7/2016)
Great product, great support from ATP!Review by Ed
I purchased an Air Dog II 165 lift pump over a year ago for my 2004.5 GMC diesel truck. Installation was easy and the pump has performed perfectly since that time. It is quiet, I only hear it when I first turn the key on and truck runs better. Shipping from ATP was fast and communication was great. ATP staff are all knowledgeable about the products they sell. I have purchased other products from them and have always had an excellent customer experience. (Posted on 10/13/2015)

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