What does a 30000 gallon underground steel fuel tank weigh?

The weight of a 30,000-gallon underground steel fuel tank can vary depending on its design and thickness, but a rough estimate is around 30,000 to 40,000 pounds (approximately 13,600 to 18,100 kg). This weight includes the steel used for construction, which typically has a density of about 490 pounds per cubic foot. Additionally, the tank's weight can increase when filled with fuel, as gasoline or diesel adds about 6 to 8 pounds per gallon.