As the plunger moves up， the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.
举一反三
- The plunger in the fuel injector pump， usually operated by a （）， is driven up and down when working.
- The （） in the injector will lift at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.
- The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.
- The high pressure in fuel injection system of the diesel engine is produced by the （）.
- A common trouble with the fuel pump plunger or fuel valve spindle is （）.