What do the boost pumps do?

What do the boost pumps do?

• A. Supply fuel to the system when the main ejector pressure is low and supply fuel for engine start
• B. Heat the fuel using the engine oil cooler
• C. Purge fuel lines during shutdown
• D. Regulate fuel pressure in the center tank

Answer: (A)

Boost pumps provide the extra fuel pressure needed when the main ejector pump can’t maintain adequate suction, and they prime the system for engine starting. They ensure a reliable fuel supply to the engine’s fuel control unit as the engine begins to spool up, preventing fuel starvation. The other tasks listed aren’t done by boost pumps: heating the fuel uses a separate heat exchanger, purging lines during shutdown is handled by a purge system, and regulating center-tank pressure is managed by a regulator/valve in the fuel system, not by the boost pump.

Boost pumps provide the extra fuel pressure needed when the main ejector pump can’t maintain adequate suction, and they prime the system for engine starting. They ensure a reliable fuel supply to the engine’s fuel control unit as the engine begins to spool up, preventing fuel starvation. The other tasks listed aren’t done by boost pumps: heating the fuel uses a separate heat exchanger, purging lines during shutdown is handled by a purge system, and regulating center-tank pressure is managed by a regulator/valve in the fuel system, not by the boost pump.