Before I looked. Into the lines first I would check the fule sending unit and I beleave u have injection. On that car I would go to your local auto parts store and get a fuel catalist like schecron to clean ur injectors. When u add it in make sure its a full tank of gas and bump up the grade of fuel you use. The lines can rust but it is very unlikely. And if they did the rust would clog your injectors. The catalist will help this and the higher octane gas will burn up any that comes through.