Fuel tank welding fire - GIF

[IntheGroove]

And always wear your finest welding attire, shorts and crocs...

[desbromilow]

using the pressure blaster as a fire suppression tool was a BIG mistake, all it did was push the fuel around the scene and make the problem bigger. There is a reason why you never use water in a fuel fire, and spreading it around is the main reason.
most pressure blasters would introduce entrained air, plus kick the fuel around enough to have the effect of fanning the fire, rather than smothering it.