Fuel Injector: Description and Operation

Fig. 7 Fuel Injector:

The injectors in the CIS system, Fig. 7, open at a preset pressure. Fuel is always present in the lines between the fuel distributor and the injectors to ensure good starting. As pressure in the fuel distributor increases (when the engine is started), the valves open and spray a constant stream of fuel. The amount of fuel injected will be determined by control pressure and the position of the air flow sensor.