If low fuel is detected in the left engine fuel feed line, which boost pumps activate?

• A. Left pump only.
• B. Right pump only.
• C. Left and Right pumps both come on.
• D. Neither pump activates until commanded.

Answer: (C)

When a fuel feed line to an engine shows low fuel, the system activates both boost pumps to maintain adequate fuel pressure and flow. This setup provides redundancy and ensures the left engine can keep getting fuel from both supply paths, even if one pump or path is strained. With both pumps running, fuel can be drawn from either wing tank and delivered through the engine feed, reducing the risk of fuel starvation and improving reliability. In short, the automatic logic uses both pumps to protect the left engine’s fuel supply under a low-fuel condition.