Some trucks are equipped with two gas tanks to increase fuel capacity, allowing them to travel longer distances without refueling. This setup is especially common in heavy-duty work trucks, long-haul pickups, and vehicles designed for off-road or remote area use.
How Dual Tank Systems Work
In a dual tank configuration, there is a main tank that supplies fuel directly to the engine and a secondary (auxiliary) tank. The secondary tank either feeds fuel into the main tank via a transfer pump or connects through a selector valve that lets the driver choose which tank to use.
Trucks Commonly Equipped with Two Gas Tanks
Ford
- Ford F Series (Older Models) – Many F 250, F 350, and F 150 models from the 1980s and 1990s had factory dual tanks, often with a cab-mounted selector switch.
- Ford Super Duty (Fleet or Utility Models) – Certain configurations can be ordered with an auxiliary tank option.
Chevrolet / GMC
- Chevy C/K and GMC Sierra (Pre‑2000 Models) – Older heavy-duty pickups often came with dual tanks from the factory.
- Modern HD Models – While most now have large single tanks, auxiliary tank options are available for fleet and work purposes.
Dodge / Ram
- Dodge Ram (Older Models) – Some earlier Ram heavy-duty trucks offered dual tank setups, especially in work or farm packages.
Toyota
- Toyota Land Cruiser 70 Series Pickup – In markets like Australia and Africa, some utility versions come with dual diesel tanks for extended range.
Commercial & Specialty Trucks
Many flatbed trucks, service vehicles, and expedition builds use dealer or aftermarket-installed auxiliary tanks to meet specific range or work requirements.
Benefits of Two Gas Tanks
- Extended Range – Ideal for long trips, rural routes, and hauling.
- Work Efficiency – Less downtime for refueling during the workday.
- Fuel Management – Flexibility to use different fuel types or manage weight balance.
Trucks with two gas tanks are most common in older heavy-duty models and specialized utility vehicles. While fewer modern pickups have factory dual tanks, auxiliary tank options remain popular for work, towing, and overlanding needs.