Engine Mobile Original Equipment Division

Engine Mobile Original Equipment Division - Solutions
Engine Mobile Original Equipment Division - Solution
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Alternative and Bio-fuels

Bio-Diesel Fuel Filtration

Leading the Way

Racor has participated in several biodiesel filtration field tests with major OEMs. Racor is actively participating in industry-wide research and development on biodiesel fuel filtration and water separation challenges. Development of technology to support the use of all biofuels is ongoing at Racor Division.

Go Big

Biodiesel tends to shorten filter life and most biodiesels have a low “interfacial tension” – meaning water easily disperses and dissolves in the fuel, greatly reducing efficiency for all types of water separators and coalescers. Racor recommends using the largest filter practical for the application to extend filter life and increase efficiency. When specifying a new biodiesel fuel system, de-rate fuel filter flow by 50% and install on the vacuum side of any pumps, where possible.

Quality Counts

Racor’s ultra high quality synthetic rubber compounds perform equally well in biodiesel and standard diesel. Seals subject to biodiesel exposure are generally replaced at the same time as the replacement filter. Racor uses all materials compatible with up to 20% biodiesel blend. Above 20% may require material changes to dynamic seals that are not normally replaced at element change-outs.

Biodiesel and Biofuel Filtration Specification Considerations

- Large primary and secondary filters at 50% of their rated flow. 

- High-quality, corrosion-resistant materials in construction. 

- High-quality, synthetic rubber compounds for seals and hoses.

- Efficient coolant and/or electric heating.

- Fuel source with high-efficiency fuel dispensing.

Biodiesel and other biofuels require extra heat, filtration, and vehicle modifications to burn in
diesel engines. Racor fuel filters and heaters are uniquely suited for filtering and conditioning
biodiesel and biofuels for use in diesel engines.

Stay Warm

All diesel fuels (other than #1) contain dissolved waxes. At cold temperatures these waxes crystalize, leading to filter plugging and fuel gelling greatly reducing flue flow, and adversely affecting the operatability of vehicles.

With biodiesel, and ultra low sulfur diesel (ULSD), there are new cold weather challenges. While proper fuel winterization normally avoids trouble, both biodiesels and ULSD may experience wax crystalization and gelling at higher than expected temperatures. Keeping this in mind, it is necessary to design an efficient fuel heating system for all cold weather applications.

Racor offers a number of efficient heaters for low flow applications and recommends using at least 200 watts of thermostatically controlled electric heating in the head and/or filter bowl. Pour point suppressants and biocides are also necessary for reliable operation and a coolant heat exchanger is required in extreme cold weather conditions.

For higher flow applications the problem is more challenging. To assure cold condition operation, a large amount of energy is required. Several options are available:

- Efficient 350-500 watt electric heater

- 150-300 watt start-up heater in conjunction with a coolant heater

- Combination coolant heater with electrical heater.


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