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A detailed experimental analysis of the pressure wave propagation phenomena and fuel-injection system dynamics in a last-generation C.R Multijet system was carried out on a high performance new test bench Moehwald-Bosch MEP2000-CA4000 under real engine simulated conditions. Specific attention was paid to the wave propagation induced pressure oscillations as well as to their relationships with system control parameters and multiple-injection performance. In particular the authors aim at illustrating how the geometrical features of each component of the injection-system hydraulic layout influence the aforementioned wave motion providing a key for design optimization in order to obtain efficient multiple injection performance. A parametric analysis on the whole injection system performance when multiple injections are executed in an injection cycle has been carried out, taking the most important geometric features, i.e. pipe lengths, pipe diameters, and rail volume, as test parameters.