Buick LeSabre gas gauge remains on full despite replacing tank and sending unit, with occasional bumping sound from fuel tank on Buick LeSabre

Some Buick LeSabre owners report experiencing issues with the gas gauge remaining on full despite replacing the tank and sending unit. This common problem may indicate a faulty fuel level sender, which, if worn, can lead to intermittent contact and inaccurate readings. Additionally, some owners find that if a new sender is installed incorrectly, it may not match the required ohm specifications, causing erratic gauge behavior. Other potential causes could include problems with the fuel pump or level sensor, as well as issues with the fuel pump access panel located in the trunk. To address these concerns, owners are advised to verify sender compatibility, inspect the fuel pump access panel, and consider seeking professional assistance to diagnose and resolve the underlying issues effectively.