The Toyota sub tank is an auxiliary fuel tank designed to increase a vehicle’s total fuel capacity and extend its driving range. Commonly found in certain Land Cruiser models and other Toyota 4x4s, the sub tank works alongside the main fuel tank to store extra fuel for long-distance travel or remote expeditions. It is especially useful for off-road enthusiasts, overlanders, and drivers operating in areas where fuel stations are scarce.
Purpose of the Sub Tank
- Extended Range – Provides additional fuel storage, allowing the vehicle to travel further without refueling.
- Emergency Reserve – Acts as a backup fuel source in case the main tank runs low in remote areas.
- Convenience – Reduces the need for frequent fuel stops during long trips.
How the Sub Tank Works
- Integrated System – In factory setups, the sub tank is connected to the main fuel system and managed by electronic controls or manual switches.
- Fuel Transfer – Depending on the design, fuel can be pumped from the sub tank to the main tank or drawn directly by the engine.
- Dashboard Controls – Many models include a dash-mounted switch and gauge to monitor and operate the sub tank.
Factory vs. Aftermarket Sub Tanks
- Factory-Fitted – Seamlessly integrated with the vehicle’s fuel system, often with OEM safety features and indicators.
- Aftermarket Options – Available in various capacities and materials such as steel, aluminum, or poly, offering customization based on needs.
- Professional Installation – Recommended for aftermarket tanks to ensure proper integration and safety compliance.
Benefits of a Toyota Sub Tank
- Overlanding Advantage – Perfect for exploring remote regions without relying on fuel availability.
- Weight Distribution – Properly placed tanks help maintain balance and stability.
- Peace of Mind – Ensures you have extra fuel on board for unpredictable conditions.
Maintenance and Safety Tips
- Regular Checks – Inspect tanks, lines, and valves for leaks or damage.
- Understand Operation – Know how to transfer fuel and read the gauges before heading out.
- Compliance – Ensure the setup meets local regulations for fuel storage and venting.
The Toyota sub tank is a valuable feature for drivers who need extended range and flexibility. If factory-installed or aftermarket, it adds practicality and confidence for long journeys, off-road adventures, and work in remote locations.