There should be a bolt on one side of the straps. Remove the bolts and the straps will drop. THe opposite side of the tank should be hinged. Look at them and you'll see how they come off.
As far as the tank, make sure to support the tank so it doesn't move unless you need to remove it. If there is a lot of gas in it, it will be heavy.
Let me know if you have other quesions.
Tuesday, February 2nd, 2010 AT 3:11 PM