What is used to drive the primary jet pump and the transfer jet pumps?

The primary jet pump and the transfer jet pumps are both driven by the engine-driven high-pressure pump in the fuel system of the T-6B aircraft. The primary jet pump facilitates the transfer of fuel from the supply tanks to the engine, while the transfer jet pumps aid in moving fuel between the tanks, ensuring that the fuel system maintains optimal levels and distribution. The engine-driven high-pressure pump provides the necessary pressure to drive these jet pumps effectively, enabling proper functionality during flight operations.

The reasoning behind the other options is that they do not accurately represent the components responsible for driving the jet pumps. For instance, the notion of using an electric boost pump is misleading because it primarily serves to supply fuel to the engine during start-up or in situations where fuel pressure may drop, rather than driving the primary or transfer jet pumps directly. Similarly, attributing the primary jet pump or the transfer jet pumps themselves as the driving force does not align with their operational roles; they are dependent on the high-pressure pump. Lastly, while the fuel management unit plays an important role in overall fuel system management, it does not provide the direct driving force for the jet pumps.