Failure of the left forward ejector, aft cell ejector, or both boost pumps will result in trapped fuel and the only indication to the aircrew will be the illumination of which warning on the EICAS page?

• A. FEED TANK
• B. FUEL GAUGE
• C. FUEL PROBE
• D. FUEL PRESSURE

Answer: (A)

Fuel is moved to the engine from a dedicated feed tank by ejector pumps and boost pumps. When the left forward ejector and aft cell ejector fail, or when both boost pumps fail, fuel can become trapped in the individual cells and stop flowing into the feed tank. With the feed path blocked, the engine has no reliable source of fuel even though other tanks still contain fuel. The EICAS warning that reflects this specific problem is the FEED TANK indication, which alerts crews to a fault in the fuel- feed system rather than just a low quantity or low pressure elsewhere in the system. The other indicators—fuel quantity gauges, or fuel pressure—don’t specifically signal that the engine feed is being starved due to the loss of ejectors or boost pumps, so FEED TANK is the correct, most direct warning for this failure scenario.