Dual fuel tanks are uncommon in most passenger cars but appear more often in trucks, SUVs, and specialty vehicles designed for long‑distance travel or heavy‑duty use. This system increases fuel capacity, allowing for extended range without refueling.
How Dual Fuel Tanks Work
A dual‑tank setup typically consists of a main tank that feeds the engine and a secondary (auxiliary) tank. The secondary tank either transfers fuel to the main tank via a pump or can be selected directly using a valve system.
Vehicles Commonly Equipped With Dual Tanks
Pickup Trucks and Work Vehicles
- Older Ford F‑Series (F‑150, F‑250, F‑350) – Many models from the 1980s and 1990s offered factory dual tanks.
- Chevy C/K and GMC Sierra (Pre‑2000) – Older heavy‑duty models often came with dual tanks.
- Ram Trucks (Older Generations) – Certain configurations included dual fuel tanks.
SUVs and 4x4s
- Toyota Land Cruiser 70 Series – Many models, especially in Australia, Africa, and the Middle East, have dual diesel tanks.
- Land Rover Defender (Older Models) – Some expedition‑spec versions came with dual tanks for long‑range travel.
Commercial and Specialty Vehicles
- Utility Trucks – Flatbeds, service trucks, and tow vehicles often have dual tanks for extended operation.
- Expedition and Overland Vehicles – Built for remote travel, often with auxiliary tanks installed by the factory or aftermarket.
Why Dual Tanks Are Used
- Extended Range – Ideal for remote or off‑road travel.
- Fuel Management – Option to separate fuel types or control vehicle weight distribution.
- Work Efficiency – Reduces downtime for refueling during long shifts.