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The assembly of all parts of the injector other than the nozzle is known as the nozzle holder. The main purpose of the nozzle holder assembly is to position and hold the fuel injection nozzle in the cylinder head. It also has a passage through which the fuel from the high pressure pipes flow to the nozzle. This is also a passage for the flow of excess fuel from the nozzle.

The function of the element is to meter and deliver the metered fuel. Element consists of barrel and plungers. The rotary motion of the plunger inside the barrel regulates the quantity of fuel and an upward motion delivers the fuel. The plunger is precisely fitted to the barrel with very small clearance to form a perfect sealing. They should be replaced as a set.