How many gallons does a GMC 2500 diesel hold?
The GMC Sierra 2500HD with a Duramax diesel typically holds about 36 gallons of fuel. This standard figure can vary slightly depending on configuration and model year.
Understanding the capacity: what it means for a heavy-duty truck
Knowing the fuel tank size helps with planning long trips, towing, and estimating range between fill-ups. For most current Sierra 2500HD diesel models, the advertised capacity is 36 gallons (about 136 liters). Exact capacity is generally the same across many cab-and-bed configurations, but there can be minor variations by year or trim.
Factors that can influence the official capacity
Several variables can affect the exact amount of fuel the factory lists for a given truck. The following points explain why two identical-looking trucks might not have the exact same quoted capacity.
- Model year and generation
- Cab configuration (Regular, Double, or Crew Cab) and bed length
- Optional equipment or factory-installed accessories that alter the tank size
- Special editions or regional packaging that may include different tank options
In most contemporary Sierra 2500HD diesel configurations, the official specification remains near 36 gallons, with variations primarily tied to the factors above.
How to confirm the exact capacity for your truck
To be certain of your specific vehicle’s fuel capacity, check a few reliable sources tailored to your exact build. The following methods can provide definitive information for your individual pickup.
- Owner’s manual or official GM specification sheets for your model year
- Vehicle door jamb sticker, which often lists tank capacity or fuel range information
- GM’s official website or a GM dealer’s service department for your VIN
Using one of these sources will confirm the precise capacity for your particular Sierra 2500HD diesel, especially if your truck has an uncommon configuration or regional option.
Summary
For most GMC Sierra 2500HD diesel trucks, the fuel tank capacity is 36 gallons. While this figure covers the standard configurations, always verify with your specific vehicle’s documentation or dealer if you have a non-standard cab/bed setup or an older model year. A full tank provides hundreds of miles of driving range, depending on driving conditions and load.
How many gallons of diesel does a 6.6 Duramax hold?
The fuel tank capacity of a 6.6 Duramax truck, such as a 2500HD or 3500HD, typically ranges from 24 to 36 gallons, depending on the cab and bed configuration. Crew cab models generally have a 36-gallon tank. Extended cab and regular cab models may have slightly smaller tanks, typically around 24 to 26 gallons.
How big is a GMC 2500 diesel tank?
The stock tank is only 36 gallons. Will not interfere with powered steps, air bag systems. Curt trailer hitch P/N 60642 and 60611 are not compatible with this tank. We recommend using B&W trailer hitch P/N GNRK1020 as an alternative.
How big is the fuel tank on a 6.6 Duramax?
A standard 6.6L Duramax fuel tank holds about 36 gallons, but replacement tanks are available with capacities of 52, 56, or 62 gallons. The specific capacity depends on the truck's model year, cab and bed configuration, and whether a standard or aftermarket tank is installed. For example, a 2020-2025 Crew Cab, Short Bed truck often has a stock 36-gallon tank, while aftermarket options can increase this to 56 or 62 gallons, as seen on Vin Specific Enterprises and TITAN Fuel Tanks.
- Standard fuel tank: Approximately 36 gallons.
- Aftermarket options:
- 52 gallons: Available for older models (2001-2010).
- 56 gallons: Available for newer models (2020-2025).
- 62 gallons: Available for a wide range of models, often for Crew Cab Short Bed configurations.
How many gallons of diesel does a GMC 2500 hold?
Fuel & MPG
| Fuel type | Diesel fuel |
|---|---|
| Range in miles (city/hwy) | 0/0 mi. |
| Fuel tank capacity | 36.0 gal. |
