Which tanks ultimately deliver fuel to the engines?

• A. Supply Tanks
• B. Aft Main Tank
• C. Forward Main Tank
• D. Center Tank

Answer: (A)

The key idea is how fuel moves to the engines. Fuel is stored in main tanks, but the engines receive fuel from a dedicated set of supply tanks. Transfer pumps move fuel from the main tanks into the supply tanks, and the engine-driven (or electric) pumps draw fuel from those supply tanks to feed the engines. Because the engine pumps take fuel from the supply tanks, these tanks are the ones that ultimately deliver fuel to the engines. The other tanks mainly store and balance fuel; they feed the supply tanks but don’t directly feed the engines.