Electronic fuel injection is a delivery system that squirts a fine mist of fuel into the combustion chambers of the engine. A computer controls the system, closely monitoring factors such as the position of the throttle, the air-fuel ratio, and the contents of the exhaust. Because the system does not use a pre-existing force, such as vacuum, to draw the fuel along the lines, the fuel pump must be located at the source — that is, inside or next to the fuel tank itself.
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