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The 1500 holds 25 gallons.
The gas tank on the 2004 GMC Sierra-1500 holds 26 gal..
The gas tank on the 2003 GMC Sierra-1500 holds 34 gal..
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 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..