At the end of an injection cycle in a time pressure fuel system, which condition describes the state of the injector's moving components?

• A. Nozzle spring closes fueling plunger
• B. TP tappet spring closes cup orifice
• C. Moving components loaded into the cup with mechanical crush
• D. Cup remains open to cylinder gas pressure

Answer: (C)

In a time-pressure fuel system, the moving parts inside the injector are set up to be held in a preloaded state by the cup assembly. At the end of an injection cycle, the components settle into the cup and are mechanically crushed together, creating a fixed preload. This preload keeps the needle valve and metering elements tightly seated, minimizes any remaining lash, and prepares the injector to respond quickly and accurately on the next cycle. The other descriptions describe situations that don’t match how the end of a cycle sets up the injector: they imply springs or open passages rather than the preloaded, seated condition inside the cup that’s established by mechanical crush.