What does Fuel Pressurization and Vent do?

• A. Maintains a positive pressure on the fuel in all tanks and vents fuel vapors overboard.
• B. Bleeds fuel back to the pump.
• C. Vents vapors to the intake.
• D. Repressurizes cabin air.

Answer: (A)

Fuel pressurization and venting is meant to keep the fuel in all tanks at a positive pressure so the fuel feed stays steady, while providing a path to release fuel vapors to the outside. This setup prevents vapor buildup and overpressure, helping ensure reliable engine fuel delivery and safe handling of vapors. Venting vapors overboard means the vapors exit the aircraft rather than entering engines or the cabin, which is how the system safely manages fuel gases. The other options describe actions that aren’t part of this function: recirculating fuel back to the pump isn’t the purpose here, directing vapors into the engine intake would risk ignition or contamination, and repressurizing cabin air belongs to the environmental control system, not the fuel system.