Last time i checked fuel tanks are supposed to be clean. Old fuel varnished. Go to home depot and buy a gallon of laquer thinner. Use a pair of gloves and your hand to get the heavy stuff out. Then switch to a stiff bristle brush to get the rest out if nessacary. Use the laquer thinner as a solvent to break up the varnish as you break it loose from the bottom.
Drain everything into a drain pan and dispose of it properly. Do not put it into the grass, it will die, Do not put it down the drain its hazardous. If you dont have a place to take it, let it evaporate over a few days and then scoop the sludge out into the garbage can.
and use a more appropriate thread title, this isnt an emergency.
