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CONSTRUCTION AND WORKING FUEL INJECTOR

 The function of fuel Injector is to deliver finely atomized fuel into the combustion chamber. It also assists in bringing each droplet of fuel in contact with sufficient oxygen in the air



Construction :

The Injector has housing . A nozzle is connected with the housing by a nozzle cap. There is a plunger with valve. It is connected with a spindle. There is a spring against the spindle. The valve is on its seat by this spring force. There is fuel passage. It connects the nozzle and pump. 

Working :

High - pressure fuel from the pump comes to the nozzle end through the passage. Due to the fuel pressure, the valve is lifted up against the spring force. Therefore, the hole in the nozzle is opened. The fuel is injected into the combustion chamber through the hole and gets atomized.

When the pressure falls , the valve comes to its seat by spring force. Thus, it closes the hole of  the nozzle. The injection pressure can be adjusted by adjusting the screw provided above the spring. A small quantity of fuel is made to leak out through valve stem for lubrication.  

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