Fuel pump just replaced by dealer but now fuel gauge not woking. on 2005 Cadillac XLR

My primary fuel pump was just replaced, now my fuel gauge is stuck at 5/8ths tank. What happened and how is this fixed?

Asked by for the 2005 Cadillac XLR
The float or sending unit inside the tank evidently has a restriction mechanically, or an electrical issue. The tank will need to be dropped again to verify the issue. Wayne