The fuel tank size on a Chevrolet Impala from 2002 to 2013 is average 17.5 gallons. The fuel tanks from 2005 to 2008 were only 16.5 gallon tanks, though.
The 2013 Chevrolet Express runs on flex-fuel (FFV).
The 2013 Chevrolet Tahoe runs on flex-fuel (FFV).
The 2002 Chevrolet S10 was fuel injected.
The 2013 Chevrolet Suburban runs on flex-fuel (unleaded/E85).
The 2013 Chevrolet Impala runs on flex-fuel (unleaded/E85).
fuel pump probably, common problem among later model impalas
The 2013 Chevrolet Silverado-3500HD runs on flex-fuel (unleaded/E85).
The 2013 Chevrolet Silverado-2500HD runs on flex-fuel (unleaded/E85).
The 2002 Chevrolet Camaro runs on regular unleaded.
The 2002 Chevrolet Malibu runs on regular unleaded.
The 2002 Chevrolet Express runs on regular unleaded.
The 2002 Chevrolet Suburban runs on regular unleaded.