To prevent feed tank failure at high altitude, which action should you perform?

• A. Turn on one boost pump
• B. Turn on both boost pumps
• C. Turn off boost pumps
• D. Check for fuel quantity

Answer: (B)

At high altitude, the engine must rely on positive pressure from the fuel system to avoid starvation. Engaging both boost pumps provides maximum fuel flow and redundancy, ensuring the feed line remains pressurized even if one pump is less than perfect. This minimizes the risk of air or vapor in the line and keeps the engine fed reliably. Using only one pump or turning them off reduces this margin and can lead to fuel starvation; simply checking fuel quantity doesn’t address the loss of feed pressure at altitude.