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Fuel injection is a system for delivering fuel to an internal combustion engine. It involves the use of electronic controls and sensors to precisely meter and deliver the correct amount of fuel to each cylinder, based on factors such as engine speed, load, and air temperature. This results in improved engine performance, fuel efficiency, and reduced emissions compared to traditional carburetor-based systems. Fuel injection is commonly used in modern automobiles, trucks, and other vehicles, and is often included as part of the engine management system. It can be found in various parts of the vehicle such as the fuel pump, fuel filter, fuel pressure regulator, injectors, and sensors like the mass air flow sensor, oxygen sensor, and throttle position sensor.