Easiest way to drain front gas tank on 94 ford f250?

The truck just broke down in the middle of the street so am racing around the clock to fix it. It does have 2 tanks on it. The rear fuel pump just went out and the front tank is full of old gas. Last time I tried to run the front tank it sucked alot of water and took forever to flush the line out so I know for a fact its full of crud, hasn't been used in over 10 years! I am for sure the pump up front works so have decided to drain this out and see if I can get it to run on the front tank, what is the easiest way to drain the tank on these trucks? siphon gas out? drop the tank? is there a drain plug? any help would be appreciated.