Quote Originally Posted by BushMasterBoy View Post
The proper way to do it, is put some nut and bolts in it and shake it about. Air clean the inside of the tank using compressed air. Then put the liquid tank liner in. The problem with welding it back together, is it will probably explode! I did that once on a boat tank in a marine repair facility. The rust absorbs the hydrocarbons, then expels them when they get warm. This was a 20 gallon tank and it blew up in my face. I was not injured. The tank was destroyed. Video below shows the procedure.


https://www.youtube.com/watch?v=Sf2veir5VHU
I've been shaking nuts and bolts around inside with fresh gas. The sludge is so thick that you can't even hear the nuts hitting the metal.
Just tonight I decided to start flushing it with water and that seemed to help as now I can see progress and you can actually hear the nuts hitting the walls.

I think before I cut it, I'll try a pressure sprayer, and maybe something like a snake to get areas the nozzle won't reach.