What is the purpose of the fuel recirculation pumps?

• A. Deliver fuel Under High Pressure to Engines
• B. Move Fuel for Temperature Regulation; Run Continuously If Boost Pumps Are Off or No Low Fuel Warning
• C. Drain Fuel from Tanks
• D. Prime Fuel Lines During Start

Answer: (B)

Fuel recirculation pumps exist to keep fuel moving inside the tanks and through the fuel system so temperatures stay even and fuel doesn’t stagnate. By circulating fuel, they prevent hot spots and vapor formation and help ensure a stable, ready supply to the engine feed even when main pumps aren’t delivering pressure.

They’re designed to run continuously when boost pumps are off or when there’s no low-fuel warning, so fuel keeps circulating and temperatures stay balanced without relying on the primary pumps alone. This is not about delivering high-pressure fuel to engines (that’s the job of boost/engine-driven pumps), draining tanks, or priming lines for start.