Old, stale fuel won't cause any damage to the fuel tank. It will muck it up with sludge which can be cleaned out with a lot of rags, paper towels, and acetone. The biggest trouble with stale fuel is the mess it makes to the internals of the fuel system. One year isn't too bad. Just suck it ALL out, refill with fresh, high octane. Until you get the old fuel out DO NOT run the fuel pump. That will just push the old stuff into the entire system. Once you get the new gas in if the system isn't too dirty the new fuel will loosen the crud and the fuel pump will circulate it into the fuel filter. After maybe 2 or 3 tankfills it would be a good idea to change the fuel filter. The big deal in the fuel tank is to make sure all of the parts are there, installed correctly, and not deteriorated. If the suction hose on the bottom of the fuel pump is mushy or split it should be replaced as it can collapse or kink under vacuum from the pump. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "Charlie <charlie_az@xxxx>" <charlie_az@xxxx> wrote: > Hello out there! > > I just have a queston?? > > For a DMC which has sat for one year or less, if the fuel is > sitting in that car of course u have to change the gas but what kind > of damage could be done to the tank itself from fuel sitting in > there?? Esp since its plastic? > > Thanx!