Which device is used to drive the boost fuel pump?

Which device is used to drive the boost fuel pump?

• A. Engine-driven fuel pump
• B. External boost pump
• C. Main fuel pump in the tank
• D. Accessory-Drive Gearbox (AGB) driven fuel pump

Answer: (D)

Fuel pressure reliability in the engine’s fuel system comes from a boost pump that is mechanically tied to the engine’s operation. When the boost pump is driven by the accessory-drive gearbox, it automatically shares the engine’s rotation and provides fuel at the right pressure as the engine speeds up or during start. This setup ensures the boost pump is available whenever the engine is turning, helping to prime the system and prevent fuel starvation during high-demand phases. The other ideas describe pumps or drives that don’t provide this direct, engine-synchronized drive to the boost pump, which is why the accessory-drive gearbox-driven pump is the correct choice.

Fuel pressure reliability in the engine’s fuel system comes from a boost pump that is mechanically tied to the engine’s operation. When the boost pump is driven by the accessory-drive gearbox, it automatically shares the engine’s rotation and provides fuel at the right pressure as the engine speeds up or during start. This setup ensures the boost pump is available whenever the engine is turning, helping to prime the system and prevent fuel starvation during high-demand phases. The other ideas describe pumps or drives that don’t provide this direct, engine-synchronized drive to the boost pump, which is why the accessory-drive gearbox-driven pump is the correct choice.