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That's the fuel heating element. It helps the diesel fuel from gelling up which can clog the fuel lines and injector ports. Old diesel fuel was more prone to this. New ultra low sulfur fuel isn't as oily as the good old diesel #2 and has more agents in it and is more refined to keep the soot levels to a minimum. The 7.3L didn't have many problems with the heating element except for they have been known to short to ground causing a fuse to blow. I can't remember which one. Other then that not many problems. Hope this helps.

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11y ago
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