yep did think that but car never much left on street so dont think anything been put in there, prob just rust/ sediment dragged in with low fuel,see how it goes hope ok!! will see, if more trouble then tank out.Gotta be careful here. If you blew something back into the tank, it's just sitting there waiting to be sucked back into the line. All kinds of interesting things wind up in a tank- kids deposit band aids, tank linings break up....
with you there. maybe a winter project!!Not trying to spend your $$$ but save yourself some heartache and install a nice new tank. Peace of mind is priceless.