The combustion properties of fatty acid alkyl monoesters,
which are the main components of biodiesel, are similar to those
of diesel fuel. Thus, there is no need to modify the engine when
it is fueled with biodiesel blends [3–5]. However, a number of practical
problems have been caused by using biodiesel in diesel
engines. Material compatibility with biodiesel is one of major concerns.
Many of materials used in a diesel engine, such as those
using in the fuel system, might not be compatible with biodiesel
[6]