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Fuel Injection is a system in automotive powertrains responsible for delivering precisely metered fuel into an engine's combustion chamber. It replaces carburetors in modern vehicles, providing improved fuel efficiency, performance, and reduced emissions. Fuel injection systems atomize fuel into fine droplets, facilitating optimal mixing with air for complete and clean combustion. This technology encompasses various components such as fuel injectors, fuel pumps, pressure regulators, and electronic control units (ECUs). These elements work together to calculate the appropriate amount of fuel needed based on factors like engine load, speed, and temperature. Fuel injection systems can be found in different configurations, including throttle body, multi-point, and direct injection setups, each with its unique advantages and applications within automotive engineering. In Automotive Repair Manuals, the Fuel Injection category covers diagnostic procedures, troubleshooting techniques, maintenance guidelines, and repair instructions for fuel injection systems. This information aids technicians in identifying issues, replacing faulty components, and restoring optimal performance to vehicles equipped with these advanced powertrain solutions.