Fen Boy;
you said:
<New Bloke - all the fuel tanks on each side feed into each other - it would have burnt for a long time with a flow of 65 litres per second.. >
Once Tank 5 emptied itself through the hole, the crew could have stopped fuel from any other tank feeding into Tank 5. The controls are on the FE's panel, and would have been a simple thing to do.
I also seem to remember that the leak rate was calculated to be somewhere in the region of 100 litres per second, or about 10 tonnes per minute.