The debris was coming from the fuel line deteriorating, not from the fuel in the tank itself. If there was water in the fuel it would be a different story. Get all the old fuel out that you can and you should be fine. Personally, I think you're shotgunning this a little. Get the fuel supply issues handled first, then if that doesn't solve the problem move on to air fuel pressure tests and flow testing the injectors. As I asked before, has anyone done a spark test or at least inspected the coils / wires?