The focus of this work is on validation of the Euler-Eulerian multiphase spray modelling approach by using the AVL’s CFD software FIRE®. Verification of the model was performed by comparing the simulation results with the existing experimental data, downloaded from the Engine Combustion Network group’s website. In this work, the multiphase spray module is used for simulating the high-pressure diesel fuel injection. Based on environmental demands, due to the increase in atmosphere pollution, there is great consideration on reduction of harmful emissions and on combustion process efficiency increasement. This is closely related to the fuel-air mixing and spray modelling processes. Because of that, a huge ammount of resources are invested in the development of mathematical models that could be used for better description of high pressure fuel injection and spray processes. During the high pressure injection the liquid core undergoes disintegration into smaller droplets which tend to disintegrate into even smaller ones. This processes are called primary and secondary break-up processes. Simultaneously, the droplets tend to evaporate. In the numerical simulations of fuel injection it is necessary to take care of the proper spray form, liquid and vaporized fuel penetration length and evaporation intensity during the computer simulation. Multiphase spray is defined by selecting the best set of coefficients of the existing models within the software package FIRE® and simulation results are compared with experimental data.