The document summarizes the key components and operation of a diesel fuel injection system. It discusses the fuel tank, fuel filter, fuel lines, fuel pumps, injectors and nozzles, ECU and sensors. The fuel is stored in the tank and delivered to the injectors by low-pressure and high-pressure fuel pumps. The ECU controls the injectors and precisely times the injection of fuel into the combustion chamber based on sensor inputs like engine speed. This allows for proper atomization and mixing of fuel for clean and efficient combustion in the diesel engine.