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This research work deals with common rail fuel injection system of a diesel engine. Fuel injection system tuning is important to provide similar conditions to each injections. This means that the timing of the fuel injection and control of the amount of the fuel during the injection have to be done accurately. The pressure oscillations might disturb the behaviour of the fuel injection event if the system is not properly designed or tuned. In this work the pressure oscillations and how to prevent them were studied. The study started with the modelling of the components of the Common Rail fuel injection system. The simulation results were verified to measured ones. After the fluid properties were also taken into account the correspondense were acceptable. The simulation model were used for studying the performance a Common Rail fuel injection system. This study deals also with the fluid properties in high pressure.