How big is the gas tank on a Ford F100?
The gas tank size for a Ford F-100 isn’t a single fixed figure; capacities vary by year, configuration, and whether a second tank was installed. In general, most vintage F-100 pickups carry about 20–25 gallons, with some larger or dual-tank configurations reaching roughly 28–30 gallons in total.
Understanding tank sizes across F-100 generations
The Ford F-100 was produced across several years and configurations, including differences in bed length, engine, and optional equipment. These variables influence the factory fuel-tank capacity, so there isn’t one universal number for all F-100 trucks.
Common capacity ranges
Below are representative ranges based on typical factory specifications and restored/frequently encountered configurations. These figures help set expectations for most standard F-100 pickups from the era.
- Standard tank on many 1965–1979 F-100 pickups: about 20–23 gallons (76–87 liters), depending on engine and bed length.
- Common mid-era configurations: about 23–25 gallons (87–95 liters).
- Optional larger or dual-tank setups: about 28–30 gallons (106–114 liters) or more total capacity; dual tanks were available on some variants and can push total capacity higher.
Note that exact capacity varies by model year, drivetrain, and whether more than one tank is installed. For precise figures, check the build sheet, owner’s manual, or a VIN-specific specification sheet for your truck.
How to verify the exact tank size for your F-100
If you need a precise number for a specific truck, use these steps to verify the capacity on your vehicle.
- Identify the exact year, bed length, and engine configuration of your F-100, since these factors influence tank size.
- Check the original owner’s manual or Ford’s factory literature for the stated tank capacity corresponding to your configuration.
- Inspect the vehicle for dual tanks or auxiliary long-range tanks (look for a second filler neck or a second tank behind the cab or in the rear of the bed).
- Look for a capacity stamp on the fuel tank itself or on a label near the fuel filler area or inside the glove box/driver’s door jamb that lists capacity.
- If documentation isn’t available, measure and estimate: drain the tank, fill with a known quantity (careful and safe method), and calculate based on the volume added to reach full.
Verifying the exact capacity may require cross-checking multiple sources or inspecting the tank configuration directly, especially for trucks with non-standard or optional tanks.
Summary
In short, the Ford F-100’s fuel-tank size isn’t universal. Most classic F-100s fall in the 20–25 gallon range, with larger capacities (28–30 gallons or more) possible on certain optional or dual-tank configurations. To know your specific truck’s capacity, consult its manual or build sheet, inspect for dual tanks, and verify against the VIN and option codes.
