posted 02-01-2002 12:17 PM ET (US)
Best way is to drop a manual pump hose down the filler neck, and pump it out. If you use the right pump, you can get it to siphon once you get the outlet below the level of the fuel (get extra hose). This also presumes it's on a trailer. As for getting every drop, you never will. Tanks DO NOT have drains because that would just be another place to leak. But if you get MOST of it, and drop in some fuel conditioner and a new fuel filter (it does have an external filter/water separator right?) on the way to the engine, you should be good to go.
Most challenging thing is now how to get rid of many gallons of old gasoline w/o polluting the environment. I run mine through the lawn mower mixed with some good fuel. It's a Briggs & Stratton, it'll burn anything!