Ground the power wire and have someone watch the gauge. If it goes to full then the gauge is working. Clean the ground connection and turn the key on and if it reads then it is okay. If not then you have a bad sending unit.
You can momentarily ground the power wire to the sending unit and the gauge should go to full.
get a circuit tester and start looking with the key on
The 2010 Chevrolet Impala runs on flex-fuel (FFV).
The 2009 Chevrolet Impala runs on flex-fuel (FFV).
The 2006 Chevrolet Impala runs on flex-fuel (FFV).
The 2007 Chevrolet Impala runs on flex-fuel (FFV).
The 2012 Chevrolet Impala runs on flex-fuel (unleaded/E85).
The 2011 Chevrolet Impala runs on flex-fuel (unleaded/E85).
The 2008 Chevrolet Impala runs on flex-fuel (unleaded/E85).
The 2013 Chevrolet Impala runs on flex-fuel (unleaded/E85).
The 2004 Chevrolet Impala runs on regular unleaded.
The 2005 Chevrolet Impala runs on regular unleaded.