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Fuel pump module. It is the little box on the right lower side of the unit, looking at the fuel tank. Try unplugging it and jumpering pins 1&3. If aux pump turns on, then it’s the transistor inside that burned up.
Technically this part is considered a consumable and non-repairable part. But it is actually very easy to fix. You just need to purchase a mje800G transistor and solder it in.