In the GTGS fuel system, which of the following lists the valve indicators?

In the GTGS fuel system, which of the following lists the valve indicators?

• A. Open Fuel Pump Parallel Valve, Open Fuel Shutoff Valve, Close Fuel Pump Parallel Valve
• B. Open Fuel Pump Valve, Open Fuel Shutoff Valve, Close Fuel Pump Valve
• C. Open Fuel Pump Parallel Valve, Close Fuel Shutoff Valve, Open Fuel Shutoff Valve
• D. Close Fuel Pump Parallel Valve, Open Fuel Pump Parallel Valve, Open Fuel Shutoff Valve

Answer: (C)

Valve indicators show the actual positions of the fuel system valves so you can confirm the correct flow path during start and operation. The best sequence reflects a safe, typical start: first, the parallel fuel pump valve is open so the pump can pressurize and deliver fuel; second, the fuel shutoff valve is closed to keep fuel from reaching the engine while priming or preparing the system; finally, the fuel shutoff valve is opened to allow fuel to flow to the engine once everything is ready. This combination matches the proper progression from priming to ready-to-run, whereas other sequences would leave the path either open when it should be blocked or would show conflicting states for the same valve.

Valve indicators show the actual positions of the fuel system valves so you can confirm the correct flow path during start and operation. The best sequence reflects a safe, typical start: first, the parallel fuel pump valve is open so the pump can pressurize and deliver fuel; second, the fuel shutoff valve is closed to keep fuel from reaching the engine while priming or preparing the system; finally, the fuel shutoff valve is opened to allow fuel to flow to the engine once everything is ready. This combination matches the proper progression from priming to ready-to-run, whereas other sequences would leave the path either open when it should be blocked or would show conflicting states for the same valve.