PURPOSE: To ensure the engine output and to prevent the secondary injection by placing a equi-pressure delivery valve in the way between a fuel injection pump and an injection nozzle while providing a pressure control path for communicating the high pressure fuel path with the low pressure section in the fuel system.

CONSTITUTION: An equi-pressure delivery valve 42 is placed in the way of high pressure fuel path 46 communicating between a fuel injection pump and injection nozzle. A pressure control path for communicating the high pressure fuel path 46 between said valve 42 and the injection nozzle with the low pressure section of fuel system and a pressure control valve 43 for opening/closing said path are provided. In such a manner, the engine output under heavy load operation is ensured while the secondary injection is prevented and the combustion noise under low load operation is reduced.