A fuel leak can initially appear as a fuel imabalance on the ECAM fuel page.
A quick check is to add the FUEL USED to the FOB to see if it tallies with the DEPARTURE FUEL. If not, something is amiss.
The QRH paper checklist for FUEL IMBALANCE is quite explicit in directing the reader to check if the condition is due to a fuel leak.
[ 03 February 2002: Message edited by: 320DRIVER ]</p>