As shown in the illustration of a gas turbine fuel oil system, when the engine fuel oil valves are de-energized, the remaining fuel left in the system is recirculated back to which of the following? Illustration GT-0021

Correct Answer: Option D — Fuel pump inlet.

Gas turbine fuel systems incorporate a recirculation path to ensure fuel remains primed and ready for immediate restart. When fuel valves are de-energized, the system design routes the trapped fuel back to the fuel pump inlet, preventing air locks and maintaining a constant supply pressure for the next ignition sequence.