A fuel injection system is used to inject fuel, under pressure into an internal combustion engine. The fuel injection system is an integral part of a modern vehicle's engine management system. A fuel injector is constructed from two main sections: main valve and spray nozzle. The pressurized fuel for the system is supplied by a fuel pump.
A Fuel injection system is more efficient than its predecessor the carburetor and can better operate at extreme temperatures while becoming more dependable at start up. A fuel injection system reacts better to situations such as high altitudes, extreme temperatures and variable fuel quality.
Fuel metering is determined by a combination of the engine air charge, vacuum and speed. Some vehicles utilize a mass airflow sensor to determine engine air intake, other systems use a MAP sensor (manifold absolute pressure)
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