You will have to remove the gas tank. Remove the retainer holding the assembly in and remove the unit. It is far less problems if you install the module assembly.
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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 fuel filter is located on the driver's side of the frame and will require a special tool to replace it.
The 2004 Chevrolet Impala runs on regular unleaded.
The 2005 Chevrolet Impala runs on regular unleaded.