My car sat for 5 years with about 3/8 of a tank of gas. Its been about 2 1/2 years back on the road, and I have had reoccurring fuel issues. I feed her a steady dose of fuel system cleaner & new filters. Im having issues again, so I swapped out yet another fuel filter again today, except instead of just tossing it, I decided to take a look at what was in it. I began with a wrag, but then put it in a cup when I really saw how bad it was. This is about an ounce of what came out of it. This is still after about 8 filters over the past 2 years! Needless to say, something is about to be done about it. Id really rather not spend the money on a new one if I don't have to. Anyone have experience cleaning a gas tank out? What works? What don't?