AirDog II DF-200 Fits 2005-2012 CUMMINS

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  • 200 gph at 15-17psi
  • Lifetime warranty
  • Built-in adjustable pressure regulator
  • Full install kit with all fittings, hose and brackets

AirDog II DF-200 Fits 2005-2012 CUMMINS


Warning: This product can expose you to chemicals that are known to the State of California to cause cancer. For more information, visit

How AirDog® Works

All Diesel Engines Need a 'State of the Art' Fuel Filtration Delivery System!

The solution is Fuel Preporator® – the only filtration delivery system that separates air from the fuel, as well as water and particulates, and maintains the proper pressure flow to the transfer pump, eliminating cavitation and vapor. Fuel Preporator significantly improves diesel engine performance.

Fuel Preporator's effectiveness has been proven over millions of truck miles. Discover how patented Fuel Preporator technology can deliver for you:

  • Increase fuel economy. (Extend fuel filter life)

  • Increase torque output. (Enjoy a quieter engine)

  • Improve throttle response. (Enjoy a smoother idle)

Fuel Preporator® Is Patent Protected


United States
5,355,860 - 5,746,184
5,529314 - 6,729,310


Additional U.S. & Foreign Patents Pending

Engineers Have Long Known About Entrained Air In Diesel Fuel

Cummins® Engine Co., Service Topic 5-135 states:

"Like water, fuel contains a certain amount of dissolved air depending upon the fuel temperature, pressure on the fuel, specific gravity and the amount of aeration to which the fuel has been subjected."

Caterpillar®, Special Instruction 651-1250 points out:

"Normally No. 2 Diesel Fuel contains about 10% air in solution, although the air is not visible."

Milwaukee School of Engineering, Handbook of Hydraulics agrees:

"Hydraulic oils also contain varying degrees of entrained air."

Parker - Racor Technical Support confirms:

"Fact ##1; There is Air entrained in diesel fuel."

Caterpillar®, PEHP7046:

"Damage can be caused by anything in your fuel system that should not be there, including particles, heat, water and air bubbles."

"Air becomes entrained in diesel fuel through agitation from pumping and sloshing in the tank. Additionally, the engine's transfer pump, operating under a vacuum, as with the conventional filter system, has a limited pressure flow available. This limited flow, which is insufficient to fully fill the pump mechanism at higher operating RPM's, results in pump cavitation and vapor. At higher altitudes, atmospheric pressure, the force that drives fuel from the tank, through the lines and filter, and into the transfer pump, decreases. This increases cavitation even more. Conventional fuel filter systems do nothing to relieve these conditions. In fact, as the filter becomes more restrictive to the fuel flow as it plugs with use, these conditions become much worse!"

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