The Pureflow AirDog II 4G 165 GPH A6SABC413 Air/Fuel Separation lift pump, or Fuel Preporator, is a must have upgrade for your 2015-2016 6.6L LML Duramax. The fuel system on your LML is the heart of the vehicle’s performance and reliability. This low pressure (8-10 psi) LML lift pump mounts in front of the fuel tank to the frame jig . The pressure side feeds the CP4 injection pump through the factory feed line on the frame. The suction/fuel supply side connects directly to the factory quick disconnect fittings on the fuel module making the install very straight forward. The Duramax sees the most benefit from adding an AirDog lift pump fuel system.



Over the life of your diesel pickup truck there may be unnecessary stress on your fuel system. High mileage and/or additional performance modifications such as a tuner or oversized injectors can weaken your injection pump, or CP4, in a shorter amount of time than with the stock fuel system. This may result in a drop in performance, reliability, and fuel economy.  Installing an AirDog II-4G lift pump will strengthen, protect, and in most cases extend the life of the fuel system and related parts. The supplied fuel filter (FF100-2) and water separator (WS100) filter your fuel down to a 2 micron rating, which surpasses the stock fuel filters capability.  The AirDog 2 4G also helps by eliminating spray pattern disruption from air entering the diesel fuel system. The result is overall increased engine efficiency by keeping the injection timing where it should be thus allowing a more complete burn of the fuel entering the cylinder. (see How It Works)


The AirDog 2 4G DF-165 will solve the infamous P0087 & P1093 low fuel rail pressure codes by supplying your CP4 injection pump with fuel, rather than your injection pump doing most of the work pulling the fuel up from the tank. This positive supply of purified fuel being fed to your injection pump will also add performance, throttle response, and longevity to your vehicle.


The AirDog II 4G 165GPH LML lift pump is recommended for Duramax trucks that have a stock to aggressively upgraded fuel system (meaning stock to larger injectors and injection pump; will also support aggressive tuning). Perfect fit for daily drivers to performance applications reaching up to 800 RWHP. See How To Choose A Lift Pump. Backed by a lifetime warranty.


Benefits of the 4G Fuel System

  • Improved Throttle Response
  • Longer Injection System Life
  • Increased Power and Torque
  • Reduced Exhaust Emissions
  • Higher than Stock Flow Rates in Some Models
  • Adjustable Fuel Pressure Regulator
  • Quiet and Smooth Pump Operation

Unlike many competitors and older AirDog products, the 4G offers features to make it more durable than any other brushed DC motor system on the market!

AirDog ® II-4G Installation for Any Skill Level

The installation of any AirDog/Raptor system has been designed with the customer in mind. We know not everyone has special tools or fabrication skills, so the installation was made as easy as possible with basic hand tools and the, occasional, power drill. The quick-connect fittings and fuel lines make this a true plug and go installation, reducing the overall installation time. The step-by-step manual outlines each process of the installation and is accompanied by visual guides to aid your progress.

All-Inclusive Installation Kit Includes:
  • Relay Control Wiring Harness
  • All required Fuel Fittings
  • 1/2″ Fuel Line
  • Mounting Brackets and Hardware
  • Installation Manual

Additional information

Weight 20.4 lbs
Dimensions 19.25 × 13.5 × 8.25 in

1 review for AirDog II-4G DF-165 | A6SABC413 | Duramax LML Lift Pump 15-16 6.6L

  1. Rated 5 out of 5
    ( 1 review )

    James A.

    This product fixed my truck. I should have put this on it years ago. No more limp mode. Balls to the wall 2cnd gear to 100, Time after time after time :-). Had injector pump ordered as well, because the truck would not start intermittently, injector pump would just not build enough pressure to start… Put Air Dog on, truck fired right up, and has been running great every since. Canceled injector pump, as I was still waiting on them to ship it out.
    Forgot to hit submit, so its been a month now… Still has not hit LIMP MODE, and i cant be happier with Air Dog!

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