A multicomponent fuel evaporation model for sprays has been formulated using the principles of the continuous thermodynamics. Hence, each component in the multicomponent fuel mixture is not described by using discrete relations for mass and energy conservation, but the fuel mixture properties and transport equations are discribed with a distribution function. The model has been applied for diesel fuels and was implemented into the CFD code KIVA-3V. The evaporation model was first applied in a single droplet single component numerical analysis to clarify the characteristics compared to the standard KIVA evaporation model. Multicomponent single droplet computations were made comparing the model to data in the literature and good agreement was observed. Finally a numerical analysis of a diesel spray evaporation under engine like conditions in a constant volume bomb was made and discussed with respect to the effects of multicomponent fuel on evaporation and ignition.