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We used several different fire extinguishers on multiple fire types during my offshore survival training. On the diesel fire, water based foam worked really well. CO2 would kill it temporarily, but once the diesel gets hot enough it just reignites. You could watch the foam build up a layer on top of the fire and walk that layer across the pan of diesel putting the fire out and preventing it from restarting. Draw back is they only work on a standing pool of liquid. If the pool is flowing it pushes the foam around and exposes more fuel to the air and lets it keep burning. Halotron or one of the other Halon gas replacements work great, but wind is the enemy with these. I think for a garage I would personally use foam, but then my garage is packed full of toys and tools so putting out the fire only to destroy the things I'm trying to save from the fire kind of defeats the purpose with the dry chemical.
 
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