Which components move fuel from the main tanks to the engines or APU?

• A. Transfer ejectors
• B. Scavenge ejectors
• C. Main ejectors or boost pumps
• D. Gravity lines

Answer: (C)

Fuel must be moved from the main tanks to the engines and APU to ensure a continuous, pressurized supply under all flight conditions. This job is done by the main ejectors, which are often called boost pumps. They pressurize and push fuel from the main tanks into the engine and APU fuel lines, providing the necessary flow to meet demand during startup, takeoff, and high-power settings. Other ejectors have different roles: transfer ejectors move fuel between tanks to balance or shuttle fuel as needed, not the primary feed to engines; scavenge ejectors pull residual fuel from sumps to keep lines primed, not to feed engines directly; gravity lines rely on gravity and do not provide reliable, pressurized fuel delivery. So the components that move fuel from the main tanks to the engines or APU are the main ejectors or boost pumps.