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Message: <blockquote data-quote="Earthwerks Unlimited" data-source="post: 17102" data-attributes="member: 1300"><p>Our family business was removing and installing gas station fule systems. Dad brought home a 10,000 gallon tank once to cut it up. It had about 6" inches of water and rusty gas in it. On top was a 24" manhole. That was a good thing. He didn't put any water in it and started torching it from the top. He got about a foot down and BOOM! It about knocked me over backward as flames like a jet engine blew 5 feet out of the manhole. It kept burning for a while. We eventually had to fill it nearly all the way up and cut it slowly. I think yu could use an abrasive saw providing you don't get very hot embers (not sparks) in the tank. Sparks won't be hot enough to start a fire. I did MIG weld a new fitting for my transfer pump on a steel fuel tank while it had about 5 gallons of diesel in it. The weld spatter did drop into the fuel and made a sizzling sound before it started to smoke out the filler opening--but never caught fire. Gasoline is whole different story. You might want to consider a pneumatic autobody power chisel--buy or rent a good quality one like Matco or Snap-On. A sawzal reciprocating saw with low tooth count blade(s) would work too. And there is very little spark from a blade and it would zing right through it.</p></blockquote><p></p>