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How big is the gas tank on a Chevy Express 3500?

The gas tank on a Chevy Express 3500 is typically 31 gallons (about 117 liters) for most gasoline-powered models. This size is standard across a wide range of engines and model years, though exact specifications can vary by configuration.


The Chevy Express 3500 is a heavy-duty, one-ton van used for cargo and passenger transport. Fuel-tank capacity matters for planning range and fueling stops, especially for long trips or fleet operations. While 31 gallons is the common size, always verify the exact figure for your specific vehicle if precise planning is required.


Typical capacity across engine configurations


For most gasoline Express 3500 variants, the tank capacity is 31 gallons. This capacity is commonly found across several engines and model years, making it a reliable baseline for range estimates.



  • 31 gallons (117 liters) — standard fuel-tank size for most gasoline-powered Chevy Express 3500 vans with common engines such as 4.3L V6, 4.8L V8, 5.3L V8, and 6.0L V8.


While 31 gallons is the typical figure, exact capacity can vary with specific configurations, model years, or fleet-focused builds. Always confirm the precise spec for your vehicle when planning long trips or heavy-duty use.


How to verify your exact tank size


To ensure you have the correct capacity for your vehicle, use these verification steps. Knowing the precise number helps with trip planning, fuel budgeting, and maintenance scheduling.



  • Check the owner's manual, which lists fuel-tank capacity in the specifications section.

  • Inspect the fuel-cap door or nearby placard for a fuel-system label that may state capacity.

  • Use the vehicle identification number (VIN) with a Chevrolet/GM service portal or contact a dealer; the VIN pulls the exact tank size and related fuel-system specs.

  • For older or fleet configurations, consult the original build sheet or fleet documentation to confirm any deviations from the standard size.


Accurate verification from official sources ensures you know your van’s true fuel capacity, which is essential for precise range calculations and budgeting.


Practical implications for drivers


Understanding the 31-gallon baseline helps drivers estimate range under typical conditions. With a combined urban/highway fuel economy in the low to mid-teens for many Express 3500 configurations, drivers can expect a multi-hundred-mile range between fills under normal driving. Fleet operators often plan refueling schedules around this standard capacity to optimize routes and downtime.


Summary


The Chevrolet Express 3500’s standard gasoline tank is generally 31 gallons (117 liters), a size that covers most engine options and model years. Always verify your exact capacity via the owner's manual, a VIN-based dealer lookup, or the vehicle’s labels to ensure accurate range planning and fuel budgeting for your specific van.

Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.