How Does the Sub Tank Work on a Land Cruiser?
Some Toyota Land Cruiser models are equipped with a sub-tank, an auxiliary fuel tank. This feature provides extra fuel capacity, extending the vehicle’s driving range and making it better suited for remote travel and off‑road expeditions.
Purpose of the Sub Tank
- Extended Range – Allows longer distances between refueling stops.
- Backup Fuel – Acts as a reserve if the main tank runs low in isolated areas.
- Expedition and Utility Use – Especially valuable in regions with sparse fuel stations.
How It Works
- Fuel Storage – The sub tank is a separate fuel reservoir located elsewhere on the vehicle, usually under the body or in the rear section.
- Fuel Transfer – The engine always draws from the main tank. When it gets low, the driver activates a switch on the dashboard to transfer fuel from the sub tank to the main tank.
- Transfer Pump – An electric pump moves the fuel, and some models have a gauge or indicator light to show the sub tank’s fuel level.
- Control System – Depending on the model, the system may prevent transfer unless the main tank has space, helping avoid overfilling.
Models with Sub Tanks
The sub tank is most common in heavy‑duty or expedition‑focused Land Cruisers, including…
- 70 Series – Especially troop carriers and utes in Australia, Africa, and the Middle East.
- 80 Series – Certain non‑U.S. models.
- 100/105 Series – Select diesel and utility configurations.
Benefits
- Increases travel range for long‑distance or off‑road trips.
- Provides an extra layer of security when traveling far from fuel stations.
- Offers flexibility in fuel management and weight distribution.