Abstract: A fuel supply system of an internal combustion engine for an automotive vehicle, comprising engine load detecting means operative to detect load on the internal combustion engine and to produce an output signal representative of the detected engine load; an electrically-operated fuel-injection nozzle assembly projecting into a combustion chamber of a power cylinder of the engine and operative to inject fuel into the combustion chamber; and an electric control unit electrically connected to the engine load detecting means and the fuel-injection nozzle assembly and operative to produce control signals to determine the durations of fuel injection and the fuel injection timings of the nozzle assembly on the basis of the signals, the fuel injection timings being determined to occur in the presence of a relatively low gas pressure in the combustion chamber.