Since the engine output is almost proportional to the injection quantity, this is adjusted by the accelerator pedal. If the injection quantity is changed with the engine speed and the injection timing is constant, the output and fuel consumption change. In diesel engines the intake of air is almost constant, irrespective of the rotating speed and load. The fuel is compressed to high pressure when the cam lifts the plunger, and is then sent to the injector. Pump elements such as the cylinder and plunger are built into the injection pump body. The diesel fuel injection system has four main functions: Some types of fuel tanks also have a fuel sedimentor at the bottom of the filter to separate water content from the fuel. feed pump – sucks fuel from the fuel tank.injection nozzle - injects the fuel into the cylinder.high-pressure pipe - sends fuel to the injection nozzle.fuel injection pump - pressurises fuel to high pressure.The diesel fuel injection system consists of: By pressurising and injecting the fuel, the system forces it into air that has been compressed to high pressure in the combustion chamber. The fuel injection system lies at the very heart of the diesel engine.
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