How is the AirDog II different then the Original Airdog?

The AirDog II incorporates the demand flow 165 (DF-165). This means that it returns a very small amount of fuel back to the tank. Any unused fuel is recirculated within the base of the unit rather than just being pump back to the tank to foam up yet again. This small amount of fuel is taking the entrained air back to the tank rather then running to your engine. The AirDog II also has an adjustable fuel pressure regulator that you can set yourself for your application. Another feature is the high flow fuel module upgrade kit which eliminates the 1/4 tank issues associated with the installation of bigger suction tubes into the tank. The return flushes back to the fuel basket to provide adequate fuel that your AirDog II needs. 

LIFETIME LIMITED EXPRESS WARRANTY: on all AirDog® 100’s, 150’s, & DF 165’s THE AIRDOG® REPLACES: the Dodge Cummins factory lift pump and filter system. Buy with confidence knowing that Rollin Smoke Diesel is a Authorized PureFlow Dealer!

ADVANCED FUEL AIR SEPARATION TECHNOLOGY: The AirDog‚ incorporates the original and latest fuel air separation technology available in the world today. This technology, not found on any other product, allows higher fuel flows from a much smaller system.

1/2” FUEL LINES INCLUDED AS STANDARD: All model AirDogs come with 1/2” fuel lines for maximum fuel flow with the least restriction. No additional charge.

NEW DEMAND FLOW TECHNOLOGY: The All New Fuel Preporator® Demand Flow system, with built-in pressure regulator, draws from the tank only the fuel flow necessary to supply the needs of the engine. Returns air & foam to the tank.

PRECISION QUALITY: Critical dimensions are machined to aircraft tolerances on “State of the Art” CNC centers resulting in a quiet, reliable unit.