While the first transfer was only 600 pounds, as the fuel leak increased the FCMC sent the entire 6,000 pounds of fuel in the trim tank to the right wing. The ECAM let the crew know this was happening, but they were focused on trying to figure out the strange oil system indications, and the timing and amount of the transfer or the possible connection to the oil indications did not register. With no more fuel available in the trim tank, the aircraft now began to develop a fuel imbalance, leading to an ECAM advisory message when there was a 3,000-pound imbalance. Still focused on the oil anomalies, the captain thought this was due to uneven fuel burn between the left and right sides, so he initiated fuel crossfeed from the left to the right side without consulting the checklist. If he had used the checklist, he would have seen a caution that said, "Do not apply this procedure if a fuel leak is suspected. Rather refer to FUEL LEAK procedure." This procedure would have instructed the crew to shutdown the right engine if they suspected a leak in an engine, and ensure the crossfeed remained closed.