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 fuel tank capacity for a 2005 GMC Sierra 1500 varies depending on the specific configuration. Generally, it has two options: either a 26-gallon or a 34-gallon tank. It's important to check the vehicle's specifications or the owner's manual for the exact capacity of a particular model.
The 2014 GMC Sierra-1500 runs on flex-fuel (FFV).
gmc 1500 sierra was fuel injected in '92
128 litres (32 gallons)
The 2013 GMC Sierra-1500 runs on regular unleaded.
The 2003 GMC Sierra-1500 runs on regular unleaded.
The 2004 GMC Sierra-1500 runs on regular unleaded.
The 2009 GMC Sierra-1500 runs on regular unleaded.
The 2005 GMC Sierra-1500 runs on regular unleaded.