Which option correctly states the action when low fuel is detected in the left engine fuel feed line?

• A. Only the left boost pump starts.
• B. Only the right boost pump starts.
• C. Both boost pumps stay off until commanded.
• D. Left and Right boost pumps both come on.

Answer: (D)

When the left engine fuel feed line is sensed as low, the system is designed to bring both boost pumps online. Activating both pumps ensures there is enough pressure and flow to the left feed line (and to the left engine) even if one pump is having reduced performance. This redundancy helps prevent fuel starvation and supports reliable fuel delivery, especially if crossfeed or additional flow is needed. If only one pump started or if pumps stayed off, there would be a higher risk of insufficient fuel supply to the left engine under low-line conditions.