What type of fuel boost pump is commonly used?

• A. The gear-type pump.
• B. The vane pump.
• C. The centrifugal type pump.
• D. The peristaltic pump.

Answer: (C)

A boost pump is chosen to move a large volume of fuel at a relatively modest pressure, especially during starting or when the engine-driven pump can’t supply enough flow. A centrifugal pump fits this role because it delivers a high flow over a wide range of engine speeds with a simple, robust design. The impeller action accelerates fuel outward, and as pump speed increases, so does the flow, making it easy to match the boost supply to the engine’s needs. Its mainly stationary, few-part construction means reliable operation and lower maintenance, which is important for fuel systems. Positive-displacement pumps like gear-type or vane pumps push fuel at higher pressures and with more precise metering, which isn’t the primary requirement for a boost pump. A peristaltic pump is suited for small, controlled dosing and handling specialized fluids, not for delivering the large volumes needed in a boost role. So the centrifugal type pump is commonly used for fuel boost pumps.