Introduction25 Fuel quality is highly dependent to its water content and the major sources of water in the fuelsrelates to the transportation, production, and storage. It is clear that the solubility of the water infuels is the function of fuel composition and temperature(Oliveira et al. 2008; Rezaei et al. 2016). It isnoteworthy to mention that soluble water content in the biodiesel is more than diesel fuel and thisfact came to the hygroscopic nature of biodiesel.