boomboomthump

I did this a few months ago to gut my whole car. Not sure of the reason behind pulling the tank but is definitely much easier if the lines are disconnected from the cooler and fully free (dangling) underneath the body/fender. That will enable you to slide (muscle) them off with some leverage.

But if you don't have a reason to do it that way, you can go about doing it the harder way (contrary to the opinion above).

paranoidandroid

I did this earlier in the year. You absolutely need the bracket reinstalled to remove the lines.The bracket holds the tank while you knock out the lines. To remove the lines, get a split shaft clamp and mount it onto the oil line. The one i used is this one:
Take a regular hammer, rest it against the line, and hit the clamp towards the front of the car, as if you are sliding the hammer on the oil line. Don't he-man it, but no need to be gentle either. Removing the plastic line holders all the way behind the front passenger fender liner helps too. Liberally spray penetrating fluid and let it soak. Get a can of computer cleaner and spray (upside down) where the line is recessed into the tank. The cold canned air will help ease the line out.