I yanked my fuel tank , and of course my fuel pump is shot (truck sat up for a long time) so i know i need a new pump. I can look in my tank , and actually reach into the bottom, and pull out old sludge fuel , dirt , etc. And the insides have some harder dirt / crust junk around in there (no rust though i don't believe). SInce i have the tank out , is there a way to get that junk out? Any product / liquid "Something" i can put in and leave for a while? PLease help - can't afford a new tank.