What is a Fuel Injector

... And How Does a Fuel Injector Work?

The fuel injector is the last stop for fuel in your engine before it goes boom inside the combustion chamber. It is basically an electrically operated gate that opens just long enough to meter the perfect amount of fuel to run the engine. On one end of the gate is the cylinder where the gas is ignited, and on the other end is a whole bunch of gas under high pressure. When your car's brain (connected to a Mass Airflow Meter or MAF to take measurements) sends an electrical impulse to the injector, it opens the gate for an short burst of fuel.