How many fuel pumps are functional in the smoke configuration?

In the smoke configuration, the aircraft's systems are adjusted to minimize the risk of fire and to manage any smoke conditions effectively. In this scenario, only the fuel pumps in the wing tanks are operational. This configuration is designed to prevent the potential for fuel being supplied from the center tanks, which could increase the risk of fire in the event of an emergency where smoke is present.

Thus, having one fuel pump from each wing tank functional ensures that the aircraft can still operate while limiting the risk associated with fuel in the center tanks. Such measures are critical to ensure safety during emergencies, thereby focusing entirely on essential operations while minimizing potential hazards.