There's a lot more to this one than a "FUEL LEAK". The fuel leaks I see on the Airbus (A300 and A310) will not cause anyone to run short of fuel.
This sounds like a fuel line separation where fuel could not be delivered to the engines from a tank or where fuel was being dumped overboard from an engine feed line.
I'm surprised that the cabin didn't report fuel for vapor dumping in the event the problemw as the latter.