6 Best Secondary Fuel Tanks For Long Range Travel Setups

The horizon stretches further when the needle on the fuel gauge stays pegged toward “full” despite hundreds of miles of remote track behind you. Mastering fuel logistics is the difference between worrying about the next gas station and focusing entirely on the landscape unfolding ahead. Equipping a vehicle for long-range travel requires balancing extra capacity with the mechanical reality of weight and space.

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Long Range America Tank: Best Integrated System

Long Range America specializes in secondary tanks that function as a seamless extension of the factory fuel system. These tanks typically utilize a transfer pump or gravity-feed system to replenish the main tank while the vehicle is in motion, meaning no manual switching is required. It is an ideal setup for those who want a “set it and forget it” experience without modifying the truck’s external profile.

Because these tanks are designed to fit specific vehicle frames, they maximize otherwise dead space underneath the chassis. This maintains a lower center of gravity compared to bed-mounted options, which is a major advantage for technical trails or uneven terrain. If the primary goal is maintaining interior cargo space while doubling operational range, this system is the gold standard.

Choose this route if the adventure involves long stretches of highway driving interrupted by remote backcountry exploration. It is a premium investment that prioritizes convenience and vehicle balance above all else. For those who demand factory-like integration, there is no more polished solution on the market.

Titan XXL Tank: Best High-Capacity Replacement

The Titan XXL is designed for the traveler who wants to eliminate the need for secondary plumbing entirely. By replacing the undersized factory plastic tank with a high-capacity, cross-linked polyethylene unit, the vehicle simply gains a much larger fuel footprint from the start. This approach keeps the entire fuel system simplified, reducing the risk of pump failures or valve leaks associated with complex auxiliary setups.

Since these tanks are molded to fit the contours of the factory location, they offer significant capacity increases—often doubling or tripling stock volume—without encroaching on bed space. They are rugged enough to handle rock strikes and the daily abuse of overlanding, making them a favorite for full-sized trucks. The internal baffling also helps prevent fuel slosh, which is critical when navigating steep mountain switchbacks.

This tank is the right choice if the objective is simplicity and maximum range without adding the weight of a secondary fuel cell. It is a one-and-done modification that keeps the center of gravity low and the exterior of the vehicle clean. For the long-distance hauler who dislikes the maintenance of external pumps and hoses, the Titan XXL is the superior choice.

S&B Tanks: The Most Durable Polyethylene Tank

S&B Tanks have earned a reputation for being nearly indestructible due to their specialized, high-density cross-linked polyethylene construction. Unlike metal tanks that can dent or rust over time, these units are designed to absorb impacts and bounce back into shape. This makes them a top-tier choice for vehicles that frequent rocky, high-clearance trails where the undercarriage takes regular abuse.

The installation process is streamlined to mirror the factory tank mounting points, making them highly compatible with standard fuel systems. Because the material is non-corrosive, it is an excellent long-term investment for those living in salty, coastal climates or harsh, winter environments where metal tanks eventually succumb to oxidation. The precise fitment ensures that no ground clearance is lost, maintaining the vehicle’s off-road geometry.

Select an S&B tank if durability in extreme environments is the top priority. If the vehicle spends more time on gnarly rocks than on pavement, the flexibility of their polyethylene design is a clear winner over rigid steel. For owners who value “fit it and forget it” reliability in the harshest conditions, this is the definitive tank.

Transfer Flow Refueling Tank: Best for Groups

Transfer Flow offers bed-mounted refueling tanks that serve double duty as auxiliary range extenders and portable fuel stations. These tanks are equipped with their own pump and nozzle, allowing the vehicle to refuel other rigs, motorcycles, or camping equipment in the field. They are essential for remote expeditions where the entire group relies on one or two vehicles for fuel replenishment.

The construction is typically high-grade aluminum, which provides a balance of low weight and high strength. While they do take up space in the bed of the truck, the trade-off is the ability to carry a massive amount of fuel safely and securely. They are also compliant with rigorous safety standards, making them a legitimate choice for those who need to transport fuel legally and professionally.

Invest in a Transfer Flow tank if the adventure involves group travel, remote support, or long-term stationary camping where internal combustion equipment is required. It is a versatile tool that transforms the truck into a logistical hub. For the trip leader who carries the weight of the group’s fuel needs, this is the most capable option available.

Rotopax Fuel Packs: Best Modular Fuel Solution

Rotopax fuel packs are the gold standard for modular, external fuel storage on smaller vehicles or overland rigs with limited space. Their unique flat design allows them to be mounted almost anywhere: on a roof rack, the side of a camper, or the back of a spare tire carrier. This modularity allows the traveler to bring exactly as much extra fuel as the specific trip demands, rather than carrying permanent dead weight.

Because they are individually sealed and ruggedly constructed, they eliminate the contamination risks associated with plumbing a large secondary tank into the main fuel system. They are the perfect safety net for a weekend trail ride where an extra five gallons might be the difference between reaching a destination and being stranded. They also integrate seamlessly with a wide range of mounting brackets, making them easy to swap between different vehicles.

Use Rotopax if the trip profile is unpredictable or if the vehicle lacks the chassis space for a large, integrated tank. They are the ideal “just in case” solution that offers flexibility without significant mechanical work. For the casual explorer who needs a backup plan, there is no more versatile or lightweight option.

Wavian Jerry Can: The Classic Bombproof Option

The Wavian steel jerry can remains the standard-bearer for reliable, manual fuel transport. Unlike cheaper aftermarket cans, Wavian units feature a high-quality powder coating and a precision-engineered gasket system that ensures a leak-proof seal even under extreme temperature fluctuations. They are the go-to for those who value mechanical simplicity and the ability to transfer fuel anywhere, anytime.

The design is intentionally classic, utilizing a robust handle system that makes them easy to carry and pour in difficult conditions. Because they are not mounted to the fuel system, they are entirely independent of the vehicle’s electrical or mechanical health. If a fuel pump fails or a line clogs, a jerry can is a foolproof way to stay mobile without a complex repair.

For the purist who believes that simple is always better, the Wavian jerry can is the only serious choice. It works every time, requires zero installation, and is easily replaced if damaged. If the priority is absolute, non-mechanical redundancy, these cans belong on the rack of the rig.

Auxiliary vs. Replacement: Which Is Right for You?

Choosing between an auxiliary tank and a replacement tank comes down to the primary mission of the vehicle. Replacement tanks generally increase overall capacity while keeping the vehicle’s original configuration intact, which is best for daily drivers and long-distance road trips. Auxiliary tanks add a dedicated second fuel source, often providing a safety buffer that can be isolated from the main tank.

• Replacement Tanks: Best for maintaining stock appearance, preserving payload space, and simplifying refueling logistics.
• Auxiliary Tanks: Best for high-mileage expedition travel, group support, and the ability to carry different types of fuel or keep a reserve tank for emergencies.

Consider the trade-offs of weight and space carefully before committing to a permanent install. Replacement tanks can add significant static weight to the rear of the vehicle, which may require suspension tuning. Auxiliary tanks offer more control but add the complexity of valves, pumps, and additional plumbing points that could potentially fail in the field.

Safe Fuel Storage and Handling on the Trail

Safety must remain at the forefront of any fuel-related modification. Always ensure that the mounting hardware is rated for the dynamic loads experienced during off-road travel, as corrugated dirt roads can cause metal fatigue on brackets very quickly. Improperly secured fuel cans are a major hazard to the vehicle, the occupants, and the surrounding environment.

Proper ventilation is the most overlooked aspect of fuel storage. Gasoline expands and contracts significantly with temperature changes; a sealed container without an adequate vent or expansion space is a ticking time bomb. Only use containers certified for fuel storage, and always keep a fire extinguisher rated for chemical fires easily accessible within the cab.

When pouring, prioritize ground-level stability to prevent spills. Static electricity is a real risk, so keep the nozzle in contact with the destination tank throughout the process. A slow, steady pour is always safer than a rushed, splashy one, regardless of how much urgency the situation demands.

Installation, Plumbing, and Legal Considerations

Installing a secondary fuel system is a significant mechanical undertaking that often requires tapping into the vehicle’s emissions or fuel delivery lines. If the installation is not done with absolute precision, fuel leaks and check-engine lights become inevitable. Always consult local regulations, as some jurisdictions have specific requirements regarding the types of tanks and plumbing allowed on passenger vehicles.

Professional installation is strongly recommended if the setup involves complex pumps or fuel-level sensor integration. A faulty installation can lead to erratic fuel gauge readings or, worse, a fuel pump that runs dry or overheats. Always test the system in a controlled environment close to home before venturing into a remote, off-grid area.

Document the installation carefully and keep a record of all components used. If a leak or failure occurs in the field, knowing exactly how the lines are plumbed and where the shut-off valves are located will save hours of frustration. A well-documented system is a safe system.

Factoring in Weight, Balance, and Suspension

Adding extra fuel means adding substantial weight; a single gallon of gasoline weighs roughly six pounds, and a 30-gallon secondary tank adds nearly 200 pounds of mass. This extra weight, especially when mounted high or far behind the rear axle, significantly alters the vehicle’s handling characteristics. It shifts the center of gravity, increases braking distances, and places extra load on the rear springs.

When installing a high-capacity tank, re-evaluating the vehicle’s suspension is mandatory. Factory leaf springs or coils may sag under the constant weight, leading to poor handling and “bottoming out” on rough terrain. Consider installing upgraded shocks and springs that are tuned for the increased GVWR (Gross Vehicle Weight Rating) to ensure the vehicle remains stable on the trail.

Always balance the load by considering what other gear is in the vehicle. If a heavy fuel tank is installed on one side, consider compensating with battery placement or gear storage to keep the truck level. An unbalanced rig is not only harder to drive but is also prone to accelerated wear on suspension bushings and tires.

Equipping a vehicle for long-range travel is a process of refinement, not just adding parts. By selecting the right fuel solution—whether it is a simple jerry can or a complex integrated tank—you expand the boundaries of where the next adventure can lead. Focus on building a reliable, balanced system, and then get out there to put those extra miles to good use.