mine is 25 US gallons.
The 1500 or 2500 trucks have a capacity of 26 or 34 gal. The 3500 will have a capacity of 50gal.
Fuel injection
98.4 litres on short box 125.9 on long box
The 2014 GMC Sierra-1500 runs on flex-fuel (FFV).
gmc 1500 sierra was fuel injected in '92
128 litres (32 gallons)
The 2004 GMC Sierra-1500 runs on regular unleaded.
The 2001 GMC Sierra-1500 runs on regular unleaded.
The 2008 GMC Sierra-1500 runs on regular unleaded.
The 2002 GMC Sierra-1500 runs on regular unleaded.
The 2010 GMC Sierra-1500 runs on regular unleaded.
The 2006 GMC Sierra-1500 runs on regular unleaded.