Generally speaking, the old QRH did not epmpahsize enough the problem of FUEL CROSSFEED in suspected FUEL LEAK situations.
The newer QRH have in bold figures reminders/hints like:
LEAK NOT FROM ENGINE or LEAK NOT LOCATED:
FUEL X FEED..................MAINTAIN CLOSED
thatīs for the A-320. I guess it is about the same for the A-330.
Any 330 driver?