How big is a 7.3 powerstroke fuel tank?
The typical fuel-tank size for the 7.3L Power Stroke in Ford's 1999–2003 Super Duty pickups is about 34 gallons (129 liters), with a larger 38-gallon (144 liters) option available on some configurations. Exact capacity varies by model year, bed length, and factory options.
Overview of the tank size for the 7.3L Power Stroke
For trucks equipped with the 7.3L Power Stroke during the late 1990s and early 2000s, the baseline fuel tank was generally in the mid-30s gallons range. The 34-gallon capacity became the standard reference for many 1999–2003 Ford F-250 and F-350 Super Duty models with the 7.3L diesel. An expanded 38-gallon option appeared on certain builds or configurations, making a noticeable difference in driving range between those specific trucks and the standard setup.
In practice, the exact capacity you’ll encounter depends on several factors, including the year within the production span, cab/bed combination, and any factory equipment or regional variations. This means two otherwise similar trucks could have slightly different total fuel capacity if one has the standard tank and the other has the larger option.
Common tank sizes you might encounter
Below is a quick reference to the capacities most frequently associated with the 7.3L Power Stroke in this era. Note that exact figures can vary by vehicle configuration.
- 34 gallons (approximately 129 liters) — standard on many 1999–2003 models
- 38 gallons (approximately 144 liters) — optional on certain configurations or builds
For buyers and owners, these figures translate into differing driving ranges, especially when the truck is used for towing or heavy payloads where fuel economy can swing widely. The 34-gallon baseline is the most common reference, with the 38-gallon option offering extended range in specific setups.
How to verify your truck’s exact capacity
To confirm the precise fuel-tank capacity for your specific vehicle, use these verification steps.
- Check the owner's manual or the Ford service data for your exact model year and bed configuration
- Inspect the fuel-filler door jamb label or a placard near the fuel area for capacity information
- Consult the vehicle’s build sheet or window sticker if you have access to the original purchase documents
- Use a VIN-based online database or contact a Ford dealer to pull the exact tank size for your VIN
Verifying firsthand ensures you have the precise figure for your truck, especially if you are evaluating range, fuel planning, or aftermarket fuel-tank changes.
Practical implications for drivers
Fuel-tank size directly affects range calculations, particularly for long trips or off-road use where fuel stops are less frequent. With a typical 34-gallon tank, a diesel-powered 7.3 can cover a substantial distance between fill-ups when running efficiently, but real-world mileage varies with payload, terrain, and driving style. An optional 38-gallon tank provides a meaningful boost in range for owners who frequently travel long highway legs or operate in remote areas.
Summary
The 7.3 Power Stroke in the 1999–2003 Ford Super Duty lineup commonly used a 34-gallon fuel tank, with a 38-gallon option available on some configurations. Because tank capacity can depend on year, bed length, and factory options, consult your vehicle’s manual, labeling, or VIN-based records to confirm the exact figure for your truck. Understanding the precise capacity helps with planning range, towing, and fuel-management decisions.
