What Is the Fuel Tank Capacity of the FJ40?
The fuel tank capacity of the FJ40 varies slightly depending on the model year and market, but most versions were designed with a relatively modest tank size suited for their era. The FJ40’s capacity was adequate for off-road adventures and rural travel, especially when paired with its fuel-efficient engines of the time.
Standard Fuel Tank Size
- Early models (1960s to early 1970s) – Typically featured a tank capacity of around 18 gallons (approximately 68 liters).
- Later models (mid-1970s to 1984) – Often upgraded to tanks holding about 21 gallons (approximately 79 liters) for extended range.
Fuel Tank Location
- Under-seat design – In many early models, the fuel tank was positioned under the driver’s seat, a common feature in older 4x4s.
- Rear-mounted tank – Later models shifted the tank location to the rear of the vehicle for improved safety and capacity.
Range & Consumption
- Average fuel economy – Depending on the engine, the FJ40 typically achieved between 12 and 15 mpg.
- Estimated range – With a full 21-gallon tank, later models could travel roughly 250 to 300 miles under mixed driving conditions.
Upgrades & Modifications
- Aftermarket tanks – Many owners install larger tanks or auxiliary sub tanks to increase range for expeditions.
- Restoration choices – During rebuilds, some choose modern fuel cell setups for improved safety and capacity.
Why Capacity Matters
- Off-road planning – Ensures enough fuel for remote travel where stations are scarce.
- Historical authenticity – Restorers often keep the original size to maintain originality.
- Versatility – Smaller tank size kept weight lower and allowed for simpler maintenance in the field.
The fuel tank capacity of the FJ40 was designed to balance range, weight, and practicality, supporting the vehicle’s role as a dependable off-road workhorse in both rugged and everyday environments.