A320 Fuel Leak scenario
Can someone please explain how to determine Fuel Leak in the scenario given below:
The flight originated with 18,400 kgs of fuel. After 2 hrs of flying there was a shortage of 200 kgs i.e when we added the fuel consumed and the FOB(say X) and subtracted the value (X) from the fuel at departure it was short by 200kgs. The difference progressively increased to 400kgs. And an imbalance developed in the sense that the left tanks were 300 kgs less than the right tanks. When we tried to calculate the leak rate we couldn't, as the fuel consumed by the engines over a fixed period of time were the same as that was being reduced from the tanks.
In this case how do I determine where the leak is from?