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Biodiesel, Fatty Acid Methyl Esters (FAME), can be made from different types of animal and vegetable oils. Its characteristics are different from those of fossil diesel, such as oxygen content, higher cold filter plugging point, and so on. Compared with fossil diesel, biodiesel can be oxidized more easily. If the fuel is oxidized, there might be product to cause some problems, like blocking filters. Therefore, the information of the storage life of the fuel is very important to vehicle owners. Moreover, the storage condition of the fuels is related to the types of source materials, additives, local weather or quality control of biodiesel. This research had used D100 and B2 fuels as experiment samples. (Blending B100 made by two different companies and represented A and B.)

With the promotion of the laws about energy consumption of engines and the emission of pollutant in recent years, the technology of diesel engine is progressing. The use of High Pressure Common Rail, HPCR, is getting common. To protect the oil supply systems with high precision and smaller gaps, the fuel filters play a more important role. On the other hand, to reduce the use of fossil energy and the emission of greenhouse gas, every country is actively promoting the use of bio-fuel that can be regenerated. However, much research in the world all indicate that using biodiesel blend will cause problems to fuel filters, including lowering the emulsified water separation efficiency, shortening the usage life of fuel filters, and so on.

With the development of world economy, the shortage in the supply of oil energy as well as the greenhouse effect have become a public concern around the world. The application of biodiesel on vehicle transportation has become the focus of development in many countries. Biodiesel, Fatty Acid Methyl Esters (FAME), is made during the process of transesterification of the animal and vegetable oils. Compared with fossil diesel, biodiesel has some characteristics, such as organic acid, higher water saturation, and oxygen content. From the results of the literatures [1] to [5], it showed that biodiesel would cause the inflation of some plastic and flexible products and the corrosion of metal materials. Metal fuel tanks have the characteristics of high flammability, high impact resistance, and good workability and are often used in commercial vehicles. The corrosion of metal materials is a natural chemical change and it can be influenced by the environment.