We still get quite a few DSMs through the shop. In addition to the ones that have always been running, we get some 1Gs that have been sitting somewhere for a long time but are still in decent shape otherwise. For one reason or another the owner decides it is time to get it dusted off, drag out all the parts that have been collecting over the years and finish that project. This is what you get when a car sits for 6 years :-P
We end up replacing the fuel pick up assy, the pump, filter and injectors. If you let it sit, safest is to at least keep the tank full I hear.