What Does “Sub” Mean in a Toyota Land Cruiser?
In many Toyota Land Cruiser models equipped with dual fuel tanks, the term “Sub” refers to the secondary or auxiliary fuel tank. This system is designed to extend the vehicle’s driving range, especially for off-road or long-distance travel.
Meaning of “Sub”
The word “Sub” appears on the fuel gauge display or dashboard in certain Land Cruiser models. It indicates the sub-tank, which is the second fuel tank that works alongside the main tank. This auxiliary tank can be…
- Manually controlled using a fuel transfer switch.
- Automatically managed by the vehicle’s fuel system, depending on the model and make.t
When fuel is being used or transferred from the sub tank, the “Sub” indicator may light up or appear on the display.
Models That Use a Sub Tank
Dual-tank systems, including a sub-tank, are commonly found in…
- 70 Series
- 80 Series
- Some 100 Series and 105 models
- Australian, African, and Middle Eastern variants are built for long-range travel.
These vehicles may hold 90 to 138 liters or more of combined fuel capacity between the main and sub tanks.
Function & Benefits
The sub-tank system is designed to…
- Extend the driving range for remote travel
- Provide redundancy in fuel supply
- Allow switching or transfer between tanks depending on usage
Some systems use a pump to transfer fuel from the sub tank to the main tank, while others draw fuel directly.