It's either 31 gallons or 40 gallons depending on the model.
The depending on which Suburban you have, Utility 30 gallons Suburban (gasoline) 44 gallons Suburban (diesel) 42 gallons
about 40 gallons
42 gallons is the tank capacity of Suburban.
45 gallons
1998 holds 44 gallons
Mine holds 40 gallons!
33.2 Imperial gallons / 29.9 US gallons or 151 Litres
25.9
around 31
42 gallons.
It will hold about 14-17 gallons of gas
My '93 Suburban held 42 gallons....in the tank. I never tried pumping it into the cargo area..