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This section examines basic EFI systems.
EFI systems use electronically controlled injectors to spray the fuel. There are 2 basic systems; throttle-body injection, also called single-point injection and multi-point injection.
Throttle-body injection sprays fuel into the air as it passes through to the intake manifold. Multi-point injection has an injector for each cylinder, which sprays fuel directly into the intake valve port.
The whole system has a fuel tank to store the fuel, a fuel pump to circulate fuel, and provide pressure in the system; a fuel filter to clean the fuel and protect the injectors. A fuel rail, or pipe, to supply the injectors with fuel; injectors which spray into the intake valve ports. A pressure regulator to control pressure in the system; a throttle-body with a throttle valve to control the flow of air to the engine; an air cleaner, ducting and an airflow meter, to provide clean, measured air and a plenum chamber or surge chamber, to dampen the flow of air.
There is also an electronic controlled unit; a computer that receives data from sensors around the engine. It processes this data and uses the results to operate the injectors.
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