I have an old craftsman pull behind rototiller which fits perfectly behind my Sears Suburban 15. Bought it at consignment auction few years back and surmised it had not been used for years and I also set it aside for a few. I finally desperately needed it for large 1.5 acre garden this year to cultivate weeds early. Did' t fool around and bought replace carb as well as new ignition coil and got it to run...after I did a meticulous clean out of the gum/shellac etc of the tank. First soaked it few days with mineral spirits then used all sorts of abrasive devices to turn the inside clean as I could. Almost continuous compressed gas blow out till it appeared reasonably clean. Had to let is set a few week till I got the tractor running and went to start it and she would run then stop then not start etc. Finally looked at the sediment bowl and it was 1/2 fill with gunk.
What else can I do to clean it short of steam cleaning at local tractor dealer or get a poly plastic tank? Tank is for a 8hp B&S.