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Didn't they say it was a sending unit ? The device that gives the pilots an indication on fuel capacity ?
Sorry, thats low voltage, low power with a circuit breaker. There is no way a wire to or from the sending unit could produce the heat needed to light a tank full of Jet-A
The plane was 27 years old. A lot of its wireing was in disrepair and maybe a high voltage wire caused a spark to jump to the low voltage wire of the sending unit, causing a short circuit which provided the spark to ignite the jet a fuel in the center tank.