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Looking alternatives for renewable energy, the Biodiesel application on automotive vehicles has been increased. Although the Biodiesel is already used for some time, some markets has been increased the Biodiesel percentage, reducing the oil dependence and pollutant emission through a cleaner energy source. However, with a high rise on level of biodiesel/diesel blend, it may happens this fuel becomes harmful to some components reducing the life time, then it′s necessary some modifications on vehicle to avoid the premature degradation. The purpose of this paper is show the influence of Biodiesel percentage increase on fuel system for commercial and passenger vehicles, and the alternatives available to avoid the system degradation.