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Parker Engine Mobile OE: Racor Products Blog & Information - North America

Keep It Hot!

Heat, gets you started. Heat, keeps you going.

Two heating options, including a patented engine return fuel recirculating technology, deliver free-flowing fuel even in the most severe weather conditions.

The GreenMAX Fuel Filter Water Separator features a patented Direct Injection Fuel Blending (DIFB) Valve. 

This DIFB Valve technology utilizes unused warm engine fuel returning to the tank to provide on-demand fuel heat transfer for cold weather conditions. This cold weather feature allows for direct fuel-to-fuel contact providing instantaneous heat rise. The increase in fuel temperature melts the wax and paraffins that separate from diesel fuel at cold temperatures (cloud point) and restrict fuel flow during the filtration stage.  The optional DIFB valve is thermostatically controlled to direct engine return fuel into the GreenMAX prior to the filtration stage. The engine return fuel is mixed with the GreenMAX incoming fuel flow from the fuel tank, providing optimum fuel temperature for efficient fuel filtration and engine performance. When the fuel system temperature is stabilized for optimum fuel filtration and engine operation, the DIFB valve automatically redirects the engine return fuel to the fuel tank

Cold Start In-Bowl Electric-Thermostatically Controlled Fuel Heating Options

To bring fuel quickly to operating temperatures in very cold conditions, optional 200W in-bowl heater is available. The in-bowl heater is thermostatically controlled and self-regulating, automatically shutting down once target fuel temperature is achieved.

To summarize GreenMAX fuel heating options: Electric heaters help you get started; hot fuel recirculating keeps you running.


  • Patented, Progressive Two-Stage Aquabloc® Media

  • Hot Engine Return Fuel Recirculating Heater

  • Ultra-High Efficiency + Capacity

  • Trademark Racor Clear Bowl & Quick Turn Drain

  • Heavy-Duty Design & Construction

High-Performance All-Weather Filtration

The one-word solution is the same as it has been for more than 40 years: Racor. Specifically, the new GreenMAX integrated fuel filter/water separator. GreenMAX is the apex of a continuous development effort to advance the art and science of filtration, a program that has made Racor filtration systems the preferred brand on engines worldwide.


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