AirDog II-4G A6SPBC259 100 gph Fuel/Air Separation System 01-10 Duramax

AirDog II-4G Fuel/Air Separation System, featuring demand flow technology and enhanced features

The Duramax is probably the most responsive diesel engine to an aftermarket lift pump. From the factory, GMC and Chevy Duramax pickup trucks don’t have a lift pump to supply fuel to the engine; the CP3 injection pump is the truck’s only means of getting fuel from the tank to the injection system. If you were to look at AirDog’s video “How the AirDog works,” it will show you what happens when the CP3 pump pulls fuel from the tank to the engine; the fuel is under constant suction, which causes cavitation and excessive wear and tear on injectors and your injection pump. This is the number 1 cause of low rail pressure codes when adding aftermarket programmers or tuners that increase the demand for fuel. By providing both constant positive fuel pressure and 100% pure fuel to the engine, an AirDog fuel system will open up the added benefits of a smoother and quieter idle, better throttle response, increased fuel economy, better mid-range through top-end power, and more consistent rail pressure to support both stock and modified engines.

The AirDog II-4G is an improvement on the older AirDog II Fuel System technology, accomplishing everything its predecessor did with the addition of a quieter, more efficient, and more reliable motor to give your truck an edge on the street and on the strip. AirDog II-4G also overcomes loss of power for diesel engines operating at higher altitudes.

The AirDog II Fuel/Air Separation System works by removing various contaminants—including entrained air/vapor, particulates, and moisture—and removes excess fuel not needed by engines, allowing the fuel to flow through the regulator and return to the fuel tank. The separated air/vapor enters the return port after the regulator, allowing pure fuel to flow to the engine at a regulated positive pressure. A gerotor pump offers quiet, long-lasting performance for your application. the AirDog II-4G features demand flow technology and an adjustable regulator that lets you fine-tune your fuel system for even further increased fuel economy, power, and performance. Get the most out of your diesel truck and ahead of the competition by installing an AirDog II-4G Fuel/Air Separation System on your truck.

How It Works:

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 contaminants, and unknown quantities of water.

The fuel passes through the water separator, which removes the large particulate contaminants that could damage or jam the gear rotor fuel pump. The fuel, with only entrained air/vapor and tiny particulate contaminants 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 contaminants 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 contaminants and power-robbing air/vapor. At pressures and flows able to meet the needs of the engine, it exits the fuel filter through 2 passageways. First, the fuel for the engine passes into the fuel pickup tube and to the engine. Then, the excess fuel not needed by the engine is recycled internally through the pressure regulator back to the water separator.