The fuel pump rates are very extreme. A plane can take off heavier than it can land. So if it is fully fueled and shortly after take off it needs to land due to

The fuel pump rates are very extreme. A plane can take off heavier than it can land. So if it is fully fueled and shortly after take off it needs to land due to emergency, it will need to dump thousands of pounds of fuel in minutes. The typical design and workflow of a larger jet like this is the engines are feed by the fuel tank nearest them. The flight engineer is on constant duty to continuously pump fuel from the center tank and/or other fuselage tanks to the tanks feeding the engines.