LongRanger TA62AP 104L Auxiliary Petrol Fuel Tank – Land Rover Discovery 3 & 4 (2005–2016) Long-Range Upgrade

LongRanger Auxiliary Fuel Tank for Land Rover Discovery 3 & 4 (2005–2016) – 104L Petrol System

Expanded Fuel Range for Remote Touring

The LongRanger TA62AP 104-litre auxiliary petrol fuel tank is engineered for Land Rover Discovery 3 and Discovery 4 models (2005–2016, petrol only). Designed to work alongside the factory fuel tank, this auxiliary system dramatically increases your vehicle’s total fuel capacity, supporting extended touring, overlanding, and off-road expeditions where refuelling opportunities are limited.

How the Auxiliary Fuel Tank System Works

This LongRanger auxiliary tank adds 104 litres of fuel storage, boosting total onboard capacity to approximately 186 litres when combined with the standard 82-litre tank. The system installs in the spare wheel location behind the rear differential, leaving the main tank untouched. Fuel is transferred from the auxiliary to the main tank via a dedicated electric pump, managed by an automatic cut-off and monitored with an integrated LED gauge and sender unit. A dual filler neck ensures seamless refuelling through the factory filler point.

Where This Upgrade Makes a Difference

The TA62AP is ideal for Discovery owners planning long-distance journeys, remote overlanding, or off-road travel in areas with sparse fuel infrastructure. It is especially valuable for vehicles carrying heavy loads, towing, or operating in environments where fuel stops are unpredictable. By increasing range and reducing the need for jerry cans, it supports safer, more efficient travel in challenging conditions.

Key Benefits for Land Rover Discovery Owners

• 104 litres of additional petrol storage for extended touring
• Up to 186 litres total capacity with factory tank
• Automatic transfer pump with cut-off and fuel level monitoring
• Designed for Discovery 3 & 4 petrol models (2005–2016)
• Heavy-duty 2 mm aluminised steel construction for off-road durability
• No exhaust modifications required; compatible with factory tow bar and Kaymar rear bar
• Maintains standard departure angle after installation

Construction and Engineering Details

LongRanger tanks are manufactured using advanced CAD/CAM processes and constructed from 2 mm aluminised steel (14-gauge) for strength and corrosion resistance. The design features internal baffling and anti-surge dams to maintain reliable fuel pickup on rough terrain, an in-built expansion chamber, and fully sealed mounting brackets with pre-drilled holes for straightforward fitting. Cross-break and parallel-break strengthening reduces fatigue cracking, while the leading edge deflection angle helps shield against rocks and debris. Each tank undergoes hydrostatic pressure testing at up to 5 psi underwater to ensure leak resistance and structural integrity.

Fuel Transfer and Monitoring System

The auxiliary system includes a solid-state cube transfer pump, automatic shut-off timers, an LED bar-style fuel gauge with transfer indicator, and a 0–90 ohm sender unit for accurate fuel level monitoring. The system automatically stops fuel transfer when the auxiliary tank is nearly empty or the main tank is full, reducing the risk of overfilling. SAE-standard fuel delivery hoses are supplied for reliable operation in automotive environments.

Installation and Vehicle Fitment Notes

• Fits Land Rover Discovery 3 (2005–2009) and Discovery 4 (2010–2016) petrol models
• Installs in the spare wheel location; spare must be relocated
• Access to the rear cargo area is required to remove the spare wheel winder
• Works with factory tow bar and Kaymar rear bar
• Installation time is typically around five hours
• Comprehensive fitting kit, instructions, and operating manual included

Vehicles with large drawer systems may require modification or temporary removal during installation. The system is designed to retain the standard departure angle and does not require exhaust modifications.

Technical Specifications

Solving Real-World Fuel Range Problems

For Discovery owners venturing into remote or off-grid environments, limited fuel access can restrict route planning and safety. The LongRanger TA62AP auxiliary tank addresses this by providing reliable, integrated long-range capacity, reducing dependence on external fuel containers and minimising refuelling stops. Its robust construction and automatic transfer system are engineered for demanding off-road use, helping you travel further with confidence.

Frequently Asked Questions

How does the auxiliary tank transfer fuel to the main tank?

The system uses a dedicated electric pump with automatic cut-off, allowing the driver to transfer fuel from the auxiliary tank to the main tank at the press of a switch. The process is monitored by an LED gauge and sender unit for safety and convenience.

Will I need to modify my exhaust or tow bar?

No exhaust modifications are required. The tank is designed to work with the factory tow bar and Kaymar rear bar, but the spare wheel must be relocated.

Is the tank suitable for diesel models?

No, the TA62AP is specifically designed for petrol-powered Discovery 3 and Discovery 4 models from 2005–2016.

What is included in the kit?

The kit includes the auxiliary tank, electric transfer pump, sender unit, LED gauge, dual filler neck, SAE-standard hoses, comprehensive fitting kit, installation instructions, and operating manual.

How long does installation take and what should I consider?

Installation typically takes around five hours. Access to the rear cargo area is required, and any large drawer systems may need to be removed or modified. The spare wheel must be relocated as the tank occupies its original position.

Does the system affect off-road clearance or departure angle?

The auxiliary tank is designed to retain the standard departure angle for Discovery 3 and 4, ensuring off-road capability is maintained.