Fuel Injectors:

Every cylinder has a fuel injector designed to meter and inject fuel within the cylinder at the proper object. To complete this function, the injectors are actuated through the engine's camshaft. The camshaft gives the timing and pumping action used through the injector to inject the fuel. An injectors meter the amount of fuel injected within the cylinder on each stroke. An amount of fuel to be injected through each injector is set through a mechanical linkage known as the fuel rack. The fuel rack position is controlled through the engine's governor. The governor denotes the amount of fuel needed to manage the desired engine speed and adjusts the amount to be injected through adjusting the position of the fuel rack.

Each and every injector operates in the following manner. As described in below Figure, fuel under pressure enters the injector by the injector's filter cap and filter element. From the filter components the fuel travels down within the supply chamber (which area among the plunger bushing and the spill deflector). A plunger operates up and down in the bushing, the bore of that is open to the fuel supply in the supply chamber through two funnel-shaped ports within the plunger bushing.

Figure: Fuel Injector Cutaway