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Very unusual. It looks like the plastic connector has incinerated. It could simply be an electrical connector failure where a small resistance in the connector caused heating which caused the resistance to go up which caused more heat which resulted in more resistance which caused...; repeat until failure. Or, as Ali says, the pump bearings froze, locked the rotor and caused a high current draw and that overheated the connector. Since it's the connector going directly into the pump, I can't see how chafed wires are involved here. Also, as landtank says, air/fuel ratio is wrong for an explosion. Sorry, no TWA-800 here.
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Tom Ferrin
N6TEF - 2m and 70cm
1989 FJ-62 - 210K, 3" OME lift, recent engine overhaul, my daily driver
1997 FZJ-80 - 93K, lifted, bumpers, sliders, lockers, OBA, new HG, and Moab-trails tested
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