A common trouble with the fuel pump plunger or fuel valve spindle is （）.
A common trouble with the fuel pump plunger or fuel valve spindle is （）.
When the follower is on the base circle of the cam， the pump plunger is at the （） of its stroke.
When the follower is on the base circle of the cam， the pump plunger is at the （） of its stroke.
The plunger in the fuel injector pump， usually operated by a （）， is driven up and down when working.
The plunger in the fuel injector pump， usually operated by a （）， is driven up and down when working.
As the plunger moves up， the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.
As the plunger moves up， the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.
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