Final answer:
Center fuel pumps in an aircraft run automatically when the MODE SEL switch is pushed out, depending on the aircraft's fuel system conditions such as requiring fuel feed from the center tank and having sufficient fuel. The operation may vary based on aircraft type and fuel management system.
Step-by-step explanation:
The center fuel pumps in an aircraft will run automatically when the MODE SEL (Mode Selector) switch is pushed out, depending on specific conditions of the aircraft's fuel system. Typically, in automatic mode, the center fuel pumps are activated when the engine fuel feed comes from the center tank and there is enough fuel to feed the engines. Once the center tank is empty or fuel is not required to be fed from the center tank to maintain balance, the pumps will stop.
In some aircraft, this might also be influenced by the position of the engine fuel feed switch, the amount of fuel in the wing tanks, and other conditional factors set by the aircraft's fuel management system. It is essential for pilots and maintenance personnel to be familiar with the specific operations of the fuel system in the aircraft they are working with to operate these systems correctly and safely.