What action must be performed to select a pump for fuel transfer?

To select a pump for fuel transfer, the correct action is to select the pump to ON. When a pump is set to the ON position, it activates the electric motor or engine that powers the pump, allowing it to move fuel from one location to another. In the context of fuel transfer operations, this activation is essential to ensure a proper flow of fuel through the system.

The other options are not suitable for initiating fuel transfer. Setting the pump to OFF would completely disable it, preventing any fuel transfer from occurring. Choosing STANDBY suggests that the pump is ready but not currently active, which is not effective for starting the transfer process. Selecting OPEN does not apply to the pump operation itself; it may refer to valves that need to be opened, but the pump must be ON to achieve fluid movement. Thus, activating the pump by selecting it to ON is crucial for the successful transfer of fuel.