How big is the fuel tank on a Ford F550?
The fuel-tank size on a Ford F-550 varies by year, model, and body configuration. In the most common setups, the standard tank is 34 gallons, with an extended 48-gallon option available on select configurations. Some fleets also use auxiliary or dual-tank arrangements that can increase usable capacity beyond the standard tank.
Standard and optional tank sizes across configurations
To understand what you might encounter, here are the typical possibilities you may find on Ford F-550 chassis cabs and related bodies. Exact capacity depends on the specific build, so always verify for your vehicle.
- Most 6.7L Power Stroke V8 diesel F-550 chassis-cab configurations use a standard 34-gallon fuel tank.
- On certain long-wheelbase chassis-cab configurations or specific upfit packages, an extended 48-gallon fuel tank has been offered as an option.
- Some fleets employ dual-tank or auxiliary-tank installations (by upfitters or OEM options) that can add significant extra capacity beyond the standard tank.
In practice, the 34-gallon tank is the baseline for many F-550 builds, with the larger 48-gallon option appearing in particular configurations and model years.
How to determine your exact fuel capacity
Because fuel-tank capacity varies by year, trim, wheelbase, and body configuration, use the following steps to confirm the exact figure for your truck.
- Check the VIN and build sheet: The window sticker or dealer documentation lists the fuel-tank capacity for the exact configuration.
- Inspect the driver’s door jamb label: It may include fuel-tank information alongside other specifications.
- Consult the owner’s manual or official Ford spec sheets for your model year.
- Contact a Ford dealer or the upfitter with your VIN for a precise confirmation.
Because upfits and fleet specifications vary, confirming the exact capacity for your specific F-550 is the best practice.
Practical implications for owners and operators
Fuel capacity affects range between fills, scheduling of refueling, and planning for missions that demand long operation times between stops. If your job requires extended range, consider an appropriate extended- or auxiliary-tank solution where compliant and feasible, while keeping weight and regulatory limits in mind.
Bottom line
For most Ford F-550 trucks, the standard fuel tank is 34 gallons, with a 48-gallon extended option available on select configurations. Exact capacity depends on model year, wheelbase, and body upfit, so verify your specific vehicle’s specification through the build sheet, VIN, or dealer.
Summary
The Ford F-550’s fuel-tank size is configuration-dependent. The typical baseline is 34 gallons, with a common optional upgrade to 48 gallons in certain setups, and some fleets may use additional tanks. For the precise figure on a particular vehicle, refer to its VIN/build sheet or check with a Ford dealer.
