Boric Acid in gas

Hopefully you replaced fuel gauge sender unless you put in the whole module. You probably can get the corroded part at a dealer or junkyard and just replace it. Actually junkyard would be cheaper and okay to use. Replace the fuel inlet hose as well and check gas tank which I surmise has already been done. Then get a locking gas cap for a while so it wont happen again unless they mess up that. Replace the fuel filter if outside the tank as well.