How big is the fuel tank on a 1977 Ford F100?
The typical fuel tank size for most 1977 Ford F-100 pickups was roughly 23–25 gallons, with some configurations offering a larger 30-gallon extended-range tank and occasional dealer-installed dual-tank setups that could increase total capacity. Exact figures vary by cab/bed configuration and options, so checking the specific truck’s documentation is essential.
Typical tank sizes and options
In the 1970s Ford offered a standard tank size, with an extended-range option and, less commonly, dual-tank setups. Here’s what was commonly found on 1977 F-100 models.
- Standard fuel tank: about 23–25 gallons (roughly 87–95 liters), depending on the exact configuration and market.
- Extended-range tank: around 30 gallons (about 114 liters) on some trucks that prioritized highway use or long-bed configurations.
- Dual-tank configurations: optional on certain configurations; total capacity varies by the number and placement of tanks (often greater than a single-tank setup but not universal).
In practice, most 1977 F-100s shipped with a single ~23–25 gallon tank, and only certain options or dealer-installed kits pushed capacity higher. Confirming the exact figure for a given truck requires checking its build data or sticker.
How to verify the exact tank size on your 1977 F-100
To confirm the precise capacity for a specific vehicle, use these steps. They account for variations by option package, bed length, and drivetrain.
- Check the factory documentation that comes with the truck, such as the original build sheet or window sticker, which often lists fuel capacity.
- Look for a fuel-capacity label or decal in the glove box, on the fuel-filler door, or under the hood; this label may show the capacity in gallons or liters.
- Decode the VIN or consult the Ford truck build database (community-maintained resources like Ford Truck Enthusiasts) to verify which tank option was installed for that VIN.
- Inspect the fuel tank(s) themselves: count the number of tanks and note their individual capacities from stamped markings; add them together for total capacity.
- Ask the seller or a Ford restoration expert if the truck has an aftermarket or dealer-installed dual-tank setup, which would affect total capacity.
Having the exact data from the build sheet or official sticker is the most reliable way to know the tank size for a specific 1977 F-100.
Notes on regional and option variations
Fuel-tank options varied by market and option bundles. Some trucks configured for long highway use or special service roles could receive larger or multiple tanks; those configurations were not universal and can significantly affect capacity.
Summary
For a 1977 Ford F-100, the standard fuel tank is typically about 23–25 gallons. A larger 30-gallon extended-range option existed for some configurations, and dealer- or aftermarket dual-tank setups could raise total capacity further. Because tank size depended on cab/bed, engine, and specific options, always verify with the vehicle’s build data or labeling to know the exact capacity.
