The PureFlow AirDog and the PureFlow AirDog II-4G are both lift pumps, or air/fuel separation pumps. PureFlow AirDog uses the term Fuel Preporator to describe their pumps. No matter what you call it, they are both in simple terms performing the same action; filtering fuel and removing air from the diesel fuel system. However the similarities end there.
The original PureFlow AirDog Fuel Preporator works similar to most lift pumps on the market. The AirDog Lift Pump gets the fuel under vacuum from the diesel fuel tank of your pick up truck. This fuel contains air/vapor, contaminants, and an unknown amount of moisture, depending on the fuel and time of year. The fuel then passes through the Water Separator to remove the water and any large contaminants that may damage or jam the gerotor pump. The pre-filtered fuel with entrained air/vapor and tiny contaminants enter the fuel pump. Then the pressurized fuel enters the 2 Micron Fuel Filter to trap any remaining particulates, and the patented Fuel Preporator separates the air/vapor through the discharged port and returns it to the tank. The remaining pressurized diesel fuel, free of any power draining air/vapor or contaminants, flows to the CP3/Cp4 or injection pump. The excess fuel is released from the Fuel Pressure Regulator and back to the tank.
The PureFlow AirDog II-4G lift pump, as stated above, does basically the same job. However the process utilizes the latest technology. The pump and base assembly are designed differently from the original AirDog. It has a low amperage motor providing efficiency. The pump assembly on the AirDog II-4G has a Dual Inlet design allowing more fuel to flow into the Gerotor. This allows the pump to increase volume without having to work any harder. The AirDog II-4G also has an adjustable regulator, so you can dial in the perfect fuel pressure for your application. The base on the AirDog II-4G is also much different. Internally the fuel is redirected through passageways after being pressurized, this allows less fuel to be returned to the tank, and more fuel to be held in the filters for a true “On Demand” system. An intermediate shaft, that centers the Gerotor Pump and Shaft Seal, was also incorporated to completely separate the electric motor from fuel path, along with an additional two bearings, to reduce drag and increase reliability and lifespan of the AirDog II-4G.
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
The PureFlow AirDog II-4G is the quietest lift pump on the market, in our opinion. The self-aligning motor reduces the noise level and requires much less maintenance. This is the lift pump that our employees install on their personal trucks, and what most of our customers purchase and install. The original AirDog pump has been a great unit over the years but the AirDog II-4G takes performance to the next level of reliability and technology.
Thank you, from the staff at ADLP.
What is the perfect fuel pressure for a 2014 LML Duramax?
Brent, The II-4G pumps come preset at 8-10psi for the LML Duramax. That is the sweet spot and correct pressure.
Hello Gary,
The recommended service interval for the fuel filter is around 15,000 miles depending on fuel quality and about double that for the water separator. Many people are changing the filters about every other oil change to keep it simple. The fuel filter is part number is FF100-2 and the water separator WS100. https://airdogliftpumps.com/product/airdog-replacement-fuel-filter-ff100-2-2-micron/ and https://airdogliftpumps.com/product/airdog-replacement-filter-ws100-water-separator/.
What is the difference between the FP and DF?
The “FP” series is the Original AirDog series and comes in 100 and 150 gallon per hour flow rates. The “DF” is the new II-4G series (a bit smaller and quieter). It comes in 100, 165 and 200gph.