Auxiliary Fuel Tank FAQ
How much fuel does a Helivue auxiliary tank add?
Each tank holds 18 gallons. Plan on about 17 usable gallons on top of your factory tank.
How do I fill it?
Through your factory filler neck. Both tanks fill at the same time at the pump, with no second filler door.
How do I move fuel into my main tank?
Press the dash switch. The included pump transfers about 0.5 gallons a minute and shuts off on its own within 6 minutes of the red empty light coming on. LED lights on the dash show the aux tank level: all green is full, flashing red is empty.
Will my truck's distance-to-empty include the aux tank?
No. It only reads your main tank. Watch the dash lights for the aux tank.
Why isn't my factory fuel gauge rising while I transfer fuel?
On the newer-generation Toyota and Lexus platforms, the factory fuel gauge may not update during a transfer from the aux tank. That includes the 4th gen Tacoma (2024+), 3rd gen Tundra (2022+), 3rd gen Sequoia (2023+), Land Cruiser 250, 6th gen 4Runner (2025+), Lexus GX550 and Lexus LX700. To get it to read correctly, put the vehicle in park, open the fuel filler door and remove the factory gas cap.
How much weight does it add, and do I need new springs?
The full system with a full tank of fuel adds about 120 pounds. No rear spring upgrade is needed.
What is it made of?
1/8 inch 5052 aluminum with a satin black hammer-finish powder coat. Designed and tested in Colorado, made in the USA.
What comes in the kit?
The tank, fuel pump, dash transfer switch with fuel gauge, stainless fuel level sender, stainless clamps, hardware and filler neck fitting.
How long does install take?
Our certified installers quote 6 hours. Find one near you on our Find an Installer page.
Does the install require welding?
It depends on your vehicle. The newer platforms need no welding: the 4th gen Tacoma (2024+), 3rd gen Tundra (2022+), Lexus GX550, Land Cruiser 250 and 6th gen 4Runner (2025+). On these, the filler neck fitting is bonded with JB Weld. Every other vehicle needs the filler neck fitting welded: the GX470, GX460, 2003 to 2024 4Runner, 2nd and 3rd gen Tacoma, and 1st gen Tundra. That weld is done on the filler neck off the vehicle, so if you don't weld, any fab shop or one of our installers can handle it.
Is there a warranty?
Yes, 3 years.
How does it ship?
UPS or FedEx, no freight. If a tank is backordered, the estimated ship date shows on the product page before you order.