What happens to the fuel recirculation pumps when the electrical boost pumps are off?

• A. They Stop Immediately
• B. They Run Continuously
• C. They Run Only With Low Fuel Warning
• D. They Run Only During Engine Start

Answer: (B)

Fuel recirculation pumps are there to keep fuel moving inside the wing tanks, preventing stagnation and helping maintain even temperature so the engines can draw fuel quickly when needed. In the Citation Longitude, the recirculation pumps run on their own electrical supply and are designed to operate continuously whenever power is available, independent of the status of the electrical boost pumps. So when the electrical boost pumps are off, the recirculation pumps still run to keep the fuel circulating. This continuous motion helps prevent fuel stagnation and ensures prompt engine fuel delivery once boosted flow is required.