What should be done after all pumping operations are completed?

After all pumping operations are completed, it is important to ensure that the engine speed is at idle and shift to neutral. This step is crucial for several reasons.

When pumping operations are finished, the apparatus should be returned to a safe and stable state, which begins with bringing the engine to idle. This helps in cooling the engine and ensures that it can be safely shut down without damaging components that may be overheating. Shifting to neutral prevents any unintended movements of the vehicle, safeguarding the crew and equipment. This practice also aligns with standard operating procedures that prioritize safety and equipment integrity.

Additionally, this methodical approach aids in preparing the vehicle for subsequent tasks, like equipment checks or driving back to the station, while keeping all personnel safe. Proper engine management even after the main operations contribute to vehicle longevity and reliability.

While other options might seem reasonable, they lack the emphasis on proper engine status and vehicle neutrality, which are essential for safety and operational readiness.