The fuel tank's capacity is 42 gallons, however the neck to the fuel tank and the long fuel lines make the total fuel capacity 44 gallons.
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 2009 Chevrolet Suburban holds 31 gal..
The gas tank on the 2015 Chevrolet Suburban holds 31.0 gal..
The gas tank on the 2002 Chevrolet Suburban holds 31 gal..
The gas tank on the 2001 Chevrolet Suburban holds 32.5 gal..
The gas tank on the 2011 Chevrolet Suburban holds 31.0 gal..
The gas tank on the 2005 Chevrolet Suburban holds 31 gal..
The gas tank on the 2003 Chevrolet Suburban holds 31 gal..
The gas tank on the 2004 Chevrolet Suburban holds 31 gal..
The gas tank on the 2006 Chevrolet Suburban holds 31 gal..
The gas tank on the 2014 Chevrolet Suburban holds 31.0 gal..