I would be seriously disappointed that the override pumps failed to deliver that last 3.77 tonnes to the working engines
The override/jettison pumps aren't designed to get the last 3000kgs or so out, the reason being that you can not inadvertantly 'jettison' all the fuel out of the tank (now that would be embarassing).
From the maintenance manual -
The override/jettison pumps can lose their prime when operated dry (pump inlets not covered by fuel). At a nominal ground attitude (wings level 0.5 degrees nose down) the left override/jettison pump inlet will be uncovered when the fuel quantity in the center wing tank is approximately 7300 pounds (3300 kilograms). The right pump inlet will be uncovered at approximately 3550 pounds (1600 kilograms). The override/jettison pump inlets in the main tanks will be uncovered when the main tank fuel quantity is between 8600 and 10,600 pounds (3900 and 4800 kilograms)