The fuel injector is an electromechanical device that sprays and atomizes the fuel. When electric current is applied to the injector coil of the device, a magnetic field is created causing the armature to move upward. This therefore pulls a the pintle valve off its seat. Once this occurs, the fuel under pressure can flow out of the injector nozzle. When the injector is de-energized, the spring pushes the ball onto its seat and stops the flow of fuel.