Where is the fuel charcoal cannister located on a 1998 lexus gs400?

Fuel pump is located on same side of the fuel, under rear driver seat where there is 3 bolt, 8 more once open, remember to disconnect the wire clip, need a thumb size stopper to stop the top fuel cap. Also once open and taken out to replace the pump- use oem or you will be cutting and connecting wires.

If you are talking about the fuel filter. Generally they are located along the frame rail under neath of the vehicle on the same side as the fuel tank.