Filters

There are a few things to keep in mind should you chose to use biodiesel. First, make sure the fuel and the biodiesel both meet the appropriate ASTM specification prior to blending.

Second, when first placed into a system, a biodiesel blend has the tendency to "clean" a fuel system. This includes the storage and the on board vehicle fuel systems. Therefore, it is not unusual for fuel filters to become filled to their capacity or plugged prematurely when biodiesel is first introduced. This is a temporary situation and the overall cleanliness of the system prior to the introduction of the biodiesel is the biggest factor in how many or how few filters are prematurely plugged. If fuel filter plugging continues, or starts again after biodiesel has been used for a period of time, the fuel system should be checked to make sure all components (i.e. solder, linings, tubes and pipes, fittings) are compatible with biodiesel.

Third, most major engine manufacturers and filter manufacturers have stated that the use of proper quality biodiesel blends up to B20 are acceptable for use with their products.

Finally, keeping biodiesel clean and dry is paramount to ensure successful and safe usage. Biodiesel stored for a long time or stored improperly can result in oxidation that produces high acid numbers, filter plugging sediments and gums, and a higher fuel viscosity.