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.