How many gallons does a 2500 Duramax hold?
The Duramax-equipped 2500HD typically has a 36-gallon fuel tank.
In practice, Silverado 2500HD and GMC Sierra 2500HD models with the 6.6L Duramax diesel share a standard 36-gallon tank, though exact capacity can vary slightly with cab and bed configuration and model year. This article outlines the standard figure and how to confirm the capacity on your specific truck.
Fuel Tank Capacity: Core figures
These are the key capacity details for the Duramax 2500HD, which influence range and fueling considerations:
- 36 gallons (approximately 136 liters) nominal capacity
- Standard across most Silverado 2500HD and Sierra 2500HD Duramax configurations
- Exact capacity should be confirmed on the vehicle's door placard or owner's manual for your specific build
Note: While 36 gallons is the typical capacity, some years or configurations may differ slightly. Always verify your truck's exact specification on the door label or with the dealer.
Why capacity matters and how to plan your trips
Knowing the fuel tank size helps with trip planning and estimating range, in combination with your vehicle's real-world fuel economy under your typical driving conditions.
How to check your exact capacity
To confirm the exact fuel tank size for your specific truck, refer to the door jamb fuel tank label, owner's manual, or VIN-based build sheet. If in doubt, contact a GM dealer with your VIN.
Understanding the tank capacity lets you plan fueling stops and anticipate range more accurately, especially on long trips or when towing loads that affect efficiency.
Summary
The 2500 Duramax generally uses a 36-gallon fuel tank (about 136 liters). Always verify the exact figure for your particular cab/bed configuration and model year on the door label or in the owner's manual.
