While making diesel fuel more sustainable with biodiesel , the increases require additional production, storage and distribution, while the resulting product is still excessively flammable. Also if not properly heated, can congeal or may separate, making the fuel too thick to pump. Therefore, the temperature of the fuel must be maintained at 70 deg F (21 C). In addition, biodiesel fueling stations must have their heat-traced biodiesel pipelines enter into a metering station so they can be periodically checked and calibrated. The heat must also be maintained withinthe metering station to keep the biodiesel viscous and flowing. However, this can behighly hazardous due to the possible presence of highly flammable and explosive vapors.

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