dump as much fuel out of the drum as possible then fill it with water and use a grinder to cut the bottom of the bead where it rolls under. then you can dump out the water and be ok, the plastic thing you see is a cover that is removable and there is a 3/4" bung under there. sounds like you are on the right track.
Yeah that's what I was afraid of ... guess I was hoping someone would tell me it was OK to just toss a match in and watch her burn . Maybe I'll drain the water down the gutter when I'm done and re-enact the Cleavland river fire and get my pyro juices going that way.
Yes I am a bit nuts. Having said that, one thing to note is that diesel is not flashy like gasoline or propane. Dump the fuel, fill the drum with water and wack away.