How Many Gallons Does a Semi Truck Hold?

June 28, 2022

The Rolling Rig

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When you factor in the radius of operation, a semi truck tank generally holds 120 to 150 gallons of fuel per tank, meaning that two tanks will total up to 300 gallons. Truck owners often ask this question because there are plenty of factors to consider when loading your semi with fuel. International Used Truck Center covers questions on fuel capacity, how to calculate weight based upon semi truck gallon capacity, and more below.

How Many Gallons Does a Semi Truck Hold?: The 95% Rule

When it comes to semi truck fuel, drivers should note that it’s advisable to fill up 95% of the total fuel capacity, whether that be 120 or 150 gallons. There are a few important reasons for this:

  • Risk of Spilling: If you don’t leave room for a little air in the tank, the overfilled tank could spill out diesel fuel via the overflow valves. Not only does this waste fuel, it also creates some serious problems for the environment and your fellow drivers.
  • Diesel Expansion: Diesel fuel expands and contracts based upon the ambient temperature of your driving environment. This even makes minor changes to the weight of your fuel!

In addition to following the 95% rule, drivers also should never let their fuel tank drain to empty; most truckers don’t let it get below 25%. This is because contaminants like dirt and bacteria tend to accumulate at the bottom of these large tanks. In fact, the suction system is designed so that it is never drawing from the very bottom of the tank!

How Much Does the Fuel in a Semi Truck Gallon Weigh?

You may know how many gallons does a semi truck hold, another common question about the semi truck gallon capacity concerns the weight of fuel. Knowing how to factor in fuel can help you better estimate your weight and avoid tickets.

  • Diesel Fuel Weight: A gallon of diesel generally weighs 7 pounds. This means when you reach the height of your semi truck gallon capacity, a tank can weigh anywhere from 840 to 1,050 pounds. Fuel weight often factors into decisions about whether to use one or two fuel tanks, as that weight can make a big difference.
  • Weight Changes: Different temperatures can increase and decrease your weight, but the variations tend to amount to less than half a pound.

Find Used Semi Trucks at International Used Truck Center!

Truckers who want to know more about their semi truck or find a great deal on used trucks can get in touch with International Used Truck Center. We’re happy to provide resources for financing and tips for drivers so you can gain the maximum amount of value from your truck. Please contact us today with any questions!

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International Used Truck Center 41.776180, -88.200918.