How to switch to the auxiliary fuel tank when the main tank is empty?
3 Answers
The main/auxiliary fuel tank switch button consists of a "SUB+fuel pump" symbol. Press it to switch the vehicle to the auxiliary tank. For trucks, pressing the "AUXILIARYFUELTANK" button will activate the auxiliary fuel tank supply.
When I was driving an off-road vehicle on a long-distance trip, I once experienced a sudden fuel depletion in the main tank. After finding a safe spot to pull over and turning off the engine, I located the manual switching switch on the dashboard or center console—usually a round knob or toggle labeled 'Main' and 'Aux.' I turned it to the auxiliary tank position, restarted the engine, and waited a few seconds for the fuel pump to draw fresh fuel. It's normal to feel the engine shudder slightly during this process. Before driving off, I always ensured the fuel pressure gauge showed normal readings. To avoid such awkward situations, I make it a habit to check the fuel levels of both tanks before long trips. The auxiliary tank is designed as an emergency backup, so it's important to activate it periodically to prevent fuel sediment buildup and clogging in the fuel lines. Regular maintenance is also crucial.
My SUV has an auxiliary fuel tank, and switching when the main tank is empty is super simple. After starting the vehicle, find a button or knob on the control panel, possibly marked with a fuel drop icon, and press or turn it to the auxiliary tank position. If you're on the highway, it's safer to slow down and pull over to the shoulder. After the operation, the engine will resume fuel supply—wait a moment to see the fuel gauge rise. Modern cars may have smart systems that automatically detect fuel level changes and adjust the supply rate, but manual switching is the most reliable. I often use the auxiliary tank to extend my trips and recommend running on it every few thousand kilometers to keep the fuel lines clear and avoid sudden failures.
