To my mind, the past tense of 'fire' applies to three kinds of events, hardening clay in a kiln, starting an engine (fired it up) or dismissing someone from a job. I have no idea why the past tense of fire does not seem to apply to burning something down. I tried googling 'fired' and found this:

http://legal-dictionary.thefreedictionary.com/fired

which covers the legal definition of arson, but I couldn't find the past tense used in the explanation.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13