What sequence describes how the fuel system operates in the T-6?

The correct sequence of operation for the fuel system in the T-6 involves the Primary Jet Pump first, which relies on gravity flow from the fuel tank to supply fuel. This is followed by the Electric Boost Pump, which serves to ensure adequate fuel pressure, especially during low fuel conditions, and assist in the operation of the system when required.

After the Electric Boost Pump, the High Pressure Pump is activated. This pump is crucial as it elevates the fuel pressure to the necessary levels for the engine operation. Following the High Pressure Pump, the Low Pressure Pump plays a role in returning fuel to the tank, thereby managing fuel pressure within the system.

Finally, the Fuel Metering Unit (FMU) regulates the flow of fuel to the engine based on the engine's requirements. This sequence ensures a reliable and efficient supply of fuel for optimal engine performance, highlighting the correct pathway through which fuel is processed from storage in the tank to combustion in the engine.

Understanding the function of each component in this sequence is essential for comprehending how the T-6's fuel system maintains engine performance and reliability during flight operations.