Brown Davis 50 Litre Gravity Feed Auxiliary Long Range Fuel Tank for Toyota Fortuner (2015–Present)

Finding room for a long range fuel tank under the Toyota Fortuner has always been a challenge. As a wagon with a relatively short wheelbase, the underside of the vehicle offers limited real estate for a traditional auxiliary tank. Brown Davis — Australia's most trusted long range fuel tank manufacturer since 1978 — engineered a clever solution specifically for the Fortuner that adds genuine extra range without compromising the spare wheel carrier or requiring expensive modifications.

The Brown Davis 50 Litre Gravity Feed Auxiliary Long Range Fuel Tank (TF15A1) is positioned above the spare wheel, which drops approximately 50mm to accommodate the tank. The tank fills through the vehicle's standard filler point and gravity feeds directly into the standard fuel tank — a simple, elegant system that requires no electric pump and no additional switching. Your Fortuner will remain on "full" while the Brown Davis gravity feed tank empties progressively into the standard tank, giving you the equivalent of 2.5 additional jerry cans of capacity.

At Brixton 4x4, we stock the full Brown Davis range and trust their engineering. The TF15A1 is one of the most practical and cost-effective long range tank solutions available for the Toyota Fortuner — no wheel carrier modifications, no electrical work, and a straightforward 2.5-hour installation.

Fits: Toyota Fortuner (2015–Present)

Note: The spare wheel drops approximately 50mm with this installation. The tank has been tested with slightly thicker All Terrain tyres — see fitment photos for reference.

Step-by-step DIY installation instructions are included with every tank. Professional installation is recommended if you are unsure.

Why Choose the Brown Davis Gravity Feed Tank for the Fortuner?

The gravity feed system is an elegantly simple solution — no electric pump, no switch, no extra wiring. Fuel flows naturally from the Brown Davis auxiliary tank into the vehicle's standard tank, keeping the fuel gauge reading full until the BD tank is exhausted. After the BD tank empties, the standard fuel system operates exactly as normal.

Important note on the "Distance to Empty" display: While the BD gravity feed tank is feeding into the standard tank, the vehicle's trip computer "distance to empty" reading will not remain accurate, as the ECU is not aware of the additional fuel capacity. Once all fuel from the BD tank has fed through, the distance to empty display will resume normal function. After extended driving with the BD tank in use, the vehicle may need to be briefly turned off to re-calibrate the distance to empty display.

Key Features

• 50 litre gravity feed auxiliary capacity — equivalent to 2.5 jerry cans of additional fuel
• Gravity feed system — no electric pump, no switch, no wiring required
• Positioned above the spare wheel — spare wheel drops approximately 50mm, no wheel carrier modifications needed
• Fills through the standard filler point — no additional filler neck or modifications
• No vehicle modifications required — designed as a clean, reversible bolt-in installation
• Compatible with all suspension — fitment not affected by aftermarket suspension upgrades
• Compatible with most aftermarket exhausts — should not be affected by aftermarket exhaust systems
• High-grade aluminised steel construction — durable, corrosion-resistant and built for off-road conditions
• 3-year manufacturer's warranty — backed by Brown Davis' Australia-wide support network
• Step-by-step DIY installation instructions included — all hardware and parts supplied

Specifications

Range Comparison

Figures based on 2.8L Toyota Fortuner fuel consumption as quoted by Toyota. Range figures are approximate and will vary based on driving conditions, terrain, load, and vehicle specification. Vehicles should never be driven to the point of running out of fuel.

Compatibility

Aftermarket Compatibility:

• Suspension: Fitment will not be affected by aftermarket suspension upgrades
• Exhausts: Should not be affected by aftermarket exhaust systems

Installation

1. 1. Unpack the tank and verify all components, hardware, and fitting instructions are present before beginning.
2. 2. Lower the spare wheel approximately 50mm to create the clearance required for the Brown Davis tank — no wheel carrier modifications are needed.
3. 3. Position the TF15A1 tank above the spare wheel in the designated mounting location and align all bracket points with the vehicle's existing fixings.
4. 4. Secure the tank using the supplied mounting hardware, hand-tightening initially before final torque.
5. 5. Connect the gravity feed line from the Brown Davis tank to the vehicle's standard fuel system — fuel will flow naturally from the BD tank into the standard tank without the need for an electric pump.
6. 6. Connect the filler tube to the vehicle's standard filler point — no additional filler neck modifications are required.
7. 7. Torque all mounting fasteners to specification, inspect all connections, and confirm there are no leaks before refuelling.

Comprehensive step-by-step DIY installation instructions with photographs are included with every tank.

For further assistance, please contact our support team.