The depending on which Suburban you have,
Utility 30 gallons
Suburban (gasoline) 44 gallons
Suburban (diesel) 42 gallons
36.5 gallons if you have the large gas tank and most did
The gas tank on the 2007 Chevrolet Suburban holds 31 gal..
The gas tank on the 2012 Chevrolet Suburban holds 31.0 gal..
The gas tank on the 2005 Chevrolet Suburban holds 31 gal..
The gas tank on the 2014 Chevrolet Suburban holds 31.0 gal..
The gas tank on the 2004 Chevrolet Suburban holds 31 gal..
The gas tank on the 2001 Chevrolet Suburban holds 32.5 gal..
The gas tank on the 2010 Chevrolet Suburban holds 31 gal..
The gas tank on the 2008 Chevrolet Suburban holds 31 gal..
The gas tank on the 2011 Chevrolet Suburban holds 31.0 gal..
The gas tank on the 2015 Chevrolet Suburban holds 31.0 gal..
The gas tank on the 2002 Chevrolet Suburban holds 31 gal..