Shortbed trucks where equipped with a 25 gallon tank. Longbeds had either the 25 or the 34 gallon tank. Measure the tank or tank shield to determine which. 25 gallon is 46"x12"x13.5" 34 gallon is 59"x14"x13.5"
The fuel tank capacity of the 1999 GMC Sierra 1500 is 26 gallons. Its fuel economy is 13 miles per gallon in the city, and 16 miles per gallon on the highway.
The gas tank on the 2011 GMC Sierra-1500 holds 26.0 gal..
The gas tank on the 2013 GMC Sierra-1500 holds 26.0 gal..
The gas tank on the 2002 GMC Sierra-1500 holds 34 gal..
The gas tank on the 2012 GMC Sierra-1500 holds 26.0 gal..
The gas tank on the 2009 GMC Sierra-1500 holds 26.0 gal..
The gas tank on the 2005 GMC Sierra-1500 holds 26 gal..
The gas tank on the 2004 GMC Sierra-1500 holds 26 gal..
The gas tank on the 2014 GMC Sierra-1500 holds 26.0 gal..
The gas tank on the 2007 GMC Sierra-1500 holds 26.0 gal..
The gas tank on the 2010 GMC Sierra-1500 holds 26.0 gal..