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A theoretical digital simulation of a conventional diesel fuel injection system has been developed. The influence of such factors as wave propagation phenomena, pipe friction, and cavitation are included. The computer results are compared with transient pressures as measured on an actual fuel injection system operated on a test bench. The comparisons show the accuracy and validity of this simulation scheme. Special attention is given to some of the important factors that affect the accuracy of the simulation model. These include the effect of pressure on the fuel bulk modulus and wave speed, the pipe line residual pressure, and the coefficient of discharge of important orifices.