If it has set for that long, that is a good place to start. The only way to drain the tank and get into it is to actually remove it. You could, however, disconnect the fuel filter and allow the fuel to be pumped out until the tank is empty. I would recommend replacing the fuel filter too and blowing out all lines.
It's been a while since 85. I can't remember if they are fuel injected or still had the carb on it. Let me know about that too.
Other things to check if it has been sitting outside. Make sure the brake lines have not rusted, fuel lines. Also, check to make sure the coolant is full, oil should be changed with a new filter, and check all other fluids. Finally, do a visual inspection to make sure no mice chewed on any of the wiring.
Let me know what you find or if you have other questions.
Saturday, July 10th, 2010 AT 9:18 PM