The computer model developed for calculating pressure #uctuations inside an automotive fuel injector (Hu et al. Journal of Sound and <ibration (submitted)) is extended to the entire fuel rail system, which consists of six injectors, a pressure regulator, pressure damper, fuel pump, and torturous fuel supply and return lines. Since the pressure #uctuations generated inside any injector can propagate throughout the entire fuel rail system, the responses of all injectors are coupled. The presence of a pressure regulator may also a!ect the dynamic responses of the fuel rail system. In Part II of this paper, formulations for describing pressure #uctuations inside the injectors, pressure regulator, and fuel rails are derived and solved simultaneously. The e!ect of twists and turns of the fuel lines on the losses of #uid kinetic energy, and that of wave propagation throughout the fuel rail system are taken into account. The computer model thus developed is validated experimentally. Measurements are conducted on a test bench that simulates a real engine with injectors "red in a particular order. The calculated pressure #uctuations inside di!erent injectors and fuel lines are compared with the measured data under various working conditions. Favorable agreements are obtained in all cases.