PureFlow AirDog

About PureFlow AirDog

For diesel truck owners who demand the best from their engines, PureFlow AirDog stands as one of the most trusted names in diesel fuel system technology. Born from decades of engineering innovation, the brand traces its roots to 1990, when founder Charles Ekstam began research that led to the development of the Fuel Preporator® — widely recognized as the world's first fuel air separation system for diesel engines with positive air separation. By 1993, the first commercial unit had reached customers, and PureFlow AirDog has been refining and advancing that technology ever since.

Patented Fuel Air Separation Technology

PureFlow AirDog holds a unique position in the diesel aftermarket: their AirDog systems are widely regarded as the only true air separation systems available for diesel engines today. The core problem they solve is significant — entrained air, water, vapor, and particulates in diesel fuel rob engines of power, reduce fuel economy, and accelerate wear on expensive injection components. The AirDog and AirDog II product families address this by filtering contaminants down to 2 microns and actively separating air and vapor from the fuel before it ever reaches the injection pump. The result is cleaner fuel delivery, more consistent injection timing, and measurably improved combustion efficiency.

The engineering team behind PureFlow AirDog brings over 30 years of diesel application experience to each product generation. Through ongoing research and development, successive generations like the AirDog II-4G and AirDog II-5G have introduced improvements in pump performance, noise reduction, and reduced maintenance demands compared to earlier designs.

The Raptor Lift Pump Line

Alongside the flagship AirDog systems, PureFlow also offers the Raptor® series of high-performance lift pumps for diesel owners who prioritize upgraded fuel flow and pressure without a full filtration overhaul. Raptor pumps feature an adjustable pressure regulator and are available in 100 GPH and 150 GPH flow configurations, making them a practical choice for moderately built engines or as a reliable factory lift pump replacement. The Raptor line is particularly well regarded among owners of 1998.5–2002 Dodge Cummins trucks equipped with Bosch VP44 injection pumps, where maintaining adequate lift pump pressure is critical to avoiding costly injection pump failures.

Broad Diesel Platform Coverage

PureFlow AirDog engineers their systems to cover the three dominant light-duty diesel platforms in the North American market: Dodge/RAM Cummins, Ford Powerstroke, and GM Duramax. Beyond the pickup truck market, PureFlow's history of development extends to commercial trucking, military, marine, agricultural, and mining diesel applications — a testament to how versatile and dependable the underlying technology truly is. Each vehicle-specific kit is designed for straightforward installation, typically including all necessary mounting hardware, fittings, and wiring to complete the job without major fabrication.

Why Diesel Enthusiasts Trust AirDog

The effectiveness of PureFlow AirDog's systems isn't just backed by customer testimonials — independent performance testing under ISO 8178 8 Mode Test criteria, as verified by EPA and CARB-certified Olsen Ecological Laboratory, has confirmed measurable improvements in fuel efficiency and emissions quality. For the serious diesel builder, a PureFlow AirDog fuel system is a foundational upgrade that protects injectors, supports higher horsepower builds, and helps the engine perform at its full potential mile after mile.