There are a number of sites that offer easy to do steps for removing and draining gas tanks of vehicles. There are also special apparatus available in the market for doing it. Here is a link that offers exact instructions;
www.wikihow.com
and the following link offers information about the use of special apparatus:
www.freepatentsonline.com
www.wikihow.com
and the following link offers information about the use of special apparatus:
www.freepatentsonline.com