Why Does the Land Cruiser Have a Second Tank?

Certain Toyota Land Cruiser models come with a second fuel tank, also called a sub-tank or auxiliary tank. This setup is designed to extend the vehicle’s driving range, making it better suited for remote travel, heavy‑duty work, and off‑road expeditions.

Purpose of the Second Tank

Extended Range – Allows the Land Cruiser to travel much farther without refueling, which is critical in areas with limited fuel stations.

Remote Travel Security – Provides a backup fuel supply in case the main tank runs low in isolated locations.

Expedition Use – Ideal for overlanding, desert crossings, and long‑distance rural driving.

How It Works

The engine always draws fuel from the main tank. When the main tank is low, the driver uses a dashboard switch to activate a pump that transfers fuel from the secondary tank to the main tank. Some models also include a dedicated gauge or warning light for the second tank.

Models That Commonly Have a Second Tank

70 Series – Many variants, especially in Australia, Africa, and the Middle East.

80 Series – Certain versions sold in non‑U.S. markets.

Utility and Troop Carrier Models – Often fitted with dual tanks for work in remote areas.