With the fuel transfer switches in AUTO, when will fuel stop being pumped from the Mid Tanks to the wing tanks?

The correct answer is based on the operational mechanisms of the fuel transfer system. When the fuel transfer switches are set to AUTO, the system is designed to maintain adequate fuel levels across the aircraft’s fuel tanks for optimal performance.

Fuel will stop being pumped from the Mid Tanks to the wing tanks when the pressure drops to approximately 5 +/- 0.5 PSI. This is because the system monitors the pressure in order to determine the flow of fuel. A pressure reading at this level indicates that the transfer operation should cease to avoid potential issues that could arise from low-pressure situations, such as cavitation or air ingestion.

This pressure threshold is a safety and operational parameter that ensures the fuel transfer is efficient and does not lead to mechanical failures or damage to the fuel system components. The other options do not represent the specific conditions under which fuel transfer is precisely controlled.