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In the present work a CFD analysis of formation and spray evolution emerging from a Multi-holes-Common Rail Diesel injector under non-evaporative conditions has been carried out. The aim of the work was to set up a tool for fuel spray simulation that could offer reasonable accuracy for the prediction of the spray tip penetration, droplet size and a reduction of CPU time. For this purpose the influence of different primary and secondary break-up models as well as drop interaction has been investigated. Phenomenological relationships have also been implemented in the code in order to enhance the prediction of the stable diameter inside the break-up models, allowing the mean drop size to be better predicted and a reduction of the time necessary to set-up the model.