Long-distance riders and adventure tourers often face the challenge of limited fuel range. An auxiliary fuel tank can extend your journey by several hundred miles, but choosing the right one requires careful consideration of capacity, mounting, material, and compatibility with your bike’s fuel system. We researched manufacturer specifications, industry safety standards, and aggregated owner feedback to bring you a curated list of the best auxiliary fuel tanks for motorcycles. Our evaluation focuses on real-world durability, ease of installation, and safety features. Whether you ride a dual-sport, cruiser, or adventure bike, this guide will help you find a reliable range extender.
| Photo | Product | Score | Buy |
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Rotopax 1.75 Gallon Fuel Pack Best Overall Auxiliary Fuel Tank 1.75 gallon capacity, HDPE plastic, universal mounting plate system |
9.2 | 🛒 Check Price |
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Tusk 2.5 Gallon Enduro Fuel Tank Best for Dual-Sport & Enduro 2.5 gallon capacity, polyethylene, includes mounting hardware |
8.7 | 🛒 Check Price |
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Giant Loop Armadillo Bag Best Flexible Fuel Bladder 1.5 gallon capacity, flexible TPU bladder, soft bag design |
8.4 | 🛒 Check Price |
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JAZ Products 20 Gallon Fuel Cell Best for Custom Builds & Large Capacity 20 gallon capacity, aluminum, requires custom mounting |
8.1 | 🛒 Check Price |
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RotoPax 2 Gallon Fuel Can Best Portable Jerry Can 2 gallon capacity, HDPE, stackable design |
8.0 | 🛒 Check Price |
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Adventure Spec 2.5L Auxiliary Fuel Bottle Best Lightweight Emergency Option 2.5 liter capacity, aluminum, screw cap |
7.8 | 🛒 Check Price |
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IMS 4.0 Gallon Oversized Fuel Tank Best Replacement Tank Upgrade 4.0 gallon capacity, polyethylene, replaces OEM tank |
7.3 | 🛒 Check Price |
1. Rotopax 1.75 Gallon Fuel Pack: Best Overall Auxiliary Fuel Tank
In our evaluation, the Rotopax 1.75 Gallon Fuel Pack stands out for its solid construction and modular design. Made from UV-stabilized, impact-resistant HDPE, this tank is built to withstand harsh off-road conditions. The universal mounting plate system allows it to be attached to most racks, panniers, or even a trailer hitch. Owner feedback consistently praises its leak-proof performance and ease of use. The vented cap includes a lockable option, adding a layer of security during long trips.
However, the Rotopax requires a separate mounting plate (sold separately), which adds to the initial investment. It may not be the best choice for riders who need a permanent, integrated solution or those on a tight budget. If you prefer a simple, carry-along container without a permanent mount, consider a flexible fuel bladder instead.
- Modular Rotopax mounting system fits most racks and panniers
- UV-stabilized, impact-resistant HDPE construction
- Integrated vented cap with lockable option for safety
Pros: Extremely durable and weather-resistant; Easy to mount and remove with quick-release plates
Cons: Requires separate mounting plate for installation
2. Tusk 2.5 Gallon Enduro Fuel Tank: Best for Dual-Sport & Enduro
The Tusk 2.5 Gallon Enduro Fuel Tank is a popular choice among off-road enthusiasts. We compared its design to OEM specifications and found it to be a reliable, budget-friendly option. Made from impact-resistant polyethylene, it mounts to the rear fender area and comes with all necessary hardware and a fuel line. Owner feedback highlights its ability to significantly extend range without adding excessive weight. The tank is designed to work with gravity-fed systems, making it simple to plumb.
However, installation may require drilling or modifying your bike’s rear fender, which could be a drawback for those who want a non-permanent solution. Also, the tank’s shape may not fit all bikes perfectly, so check compatibility before purchase. If you ride a modern adventure bike with complex fuel injection, consider a more integrated system.
- Designed specifically for enduro and dual-sport bikes with rear fender mounting
- Durable polyethylene construction resists impacts and UV
- Includes all necessary mounting hardware and fuel line
Pros: Good value with included hardware; Fits many popular dual-sport models
Cons: Installation can be tricky on some bikes
3. Giant Loop Armadillo Bag: Best Flexible Fuel Bladder
For riders who need occasional range extension without permanent mounting, the Giant Loop Armadillo Bag is a top contender. We evaluated its flexible TPU construction, which features welded seams for leak resistance. It collapses flat when empty, making it easy to stow in luggage. The included quick-connect fuel line and vented cap allow for simple transfer to your main tank. Owner feedback commends its durability on rough trails and its ability to withstand abrasion.
However, the Armadillo Bag holds only 1.5 gallons, which may not be enough for extreme long-distance touring. Additionally, the flexible design means it must be placed carefully to avoid pinching or rubbing. Riders who want a large, fixed auxiliary tank should look elsewhere. This bag is ideal for those who want a backup fuel supply for emergencies or short range boosts.
- Collapsible when empty, easy to store in a backpack or saddlebag
- Made from abrasion-resistant TPU with welded seams
- Includes quick-connect fuel line and vented cap
Pros: Lightweight and packable when not in use; Durable construction with no rigid parts
Cons: Lower capacity compared to rigid tanks
4. JAZ Products 20 Gallon Fuel Cell: Best for Custom Builds & Large Capacity
The JAZ Products 20 Gallon Fuel Cell is a serious piece of equipment designed for custom builds or heavy-duty touring rigs. In our research, we found that its aluminum construction and internal baffles meet racing safety standards. The included fuel-safe foam minimizes slosh and static buildup. This tank is ideal for riders who need to cover vast distances without refueling, such as on transcontinental trips or in remote areas.
However, this fuel cell is not a bolt-on solution. It requires custom fabrication for mounting and fuel system integration, which can be costly and time-consuming. Its large size and weight (over 20 pounds empty) also affect handling. Most motorcycle owners will find it overkill and impractical. This product is best suited for experienced builders or sidecar rigs where space and weight are less critical.
- Large 20 gallon capacity for extreme range
- Aluminum construction with internal baffles
- Fuel-safe foam included for slosh reduction
Pros: Massive capacity for long expeditions; Built to racing standards with safety foam
Cons: Heavy and requires significant fabrication for mounting
5. RotoPax 2 Gallon Fuel Can: Best Portable Jerry Can
The RotoPax 2 Gallon Fuel Can is a portable solution for carrying extra fuel on a motorcycle. We compared its specifications to other jerry cans and found it to be a very durable. Made from HDPE with a UV-resistant coating, it can withstand rough handling. The stackable design allows multiple cans to be secured together, which is useful for long trips. It meets DOT and EPA standards for fuel storage, ensuring safety during transport.
However, this can is not a direct auxiliary tank; it requires manual pouring or a separate fuel line to transfer fuel to your bike. This can be inconvenient on the road. Additionally, the can’s rectangular shape may be bulky to pack. It is best suited for riders who want a rugged, portable container rather than a permanent installation.
- Stackable design with interlocking grooves
- Approved for fuel storage and transport
- Compatible with Rotopax mounting system
Pros: Durable and stackable for efficient packing; Meets DOT/EPA standards for fuel containers
Cons: Requires separate spout or fuel line for transfer
6. Adventure Spec 2.5L Auxiliary Fuel Bottle: Best Lightweight Emergency Option
The Adventure Spec 2.5L Auxiliary Fuel Bottle is a minimalist solution for emergency fuel. We evaluated its aluminum construction and found it to be adequately durable for occasional use. The screw cap with O-ring seal prevents leaks, though it is not designed for repeated heavy use. This bottle is ideal for riders who want a small, cheap backup for unexpected situations, such as running out of fuel in remote areas.
However, its small capacity (2.5 liters) provides only about 30-50 miles of extra range, depending on your bike. It also requires manual pouring, which can be messy. The bottle is not designed for permanent mounting and may roll around in luggage. If you need a more substantial range increase, consider a larger tank.
- Ultra-lightweight at less than 1 pound
- Compact design fits in a backpack or pannier
- Simple screw cap with O-ring seal
Pros: Very affordable and lightweight; Easy to carry as a backup
Cons: Small capacity limits range extension
7. IMS 4.0 Gallon Oversized Fuel Tank: Best Replacement Tank Upgrade
The IMS 4.0 Gallon Oversized Fuel Tank is a replacement tank that increases fuel capacity without adding a separate auxiliary unit. We researched its compatibility and found it fits many popular dirt bikes and dual-sports. Made from polyethylene, it is lighter than stock metal tanks and offers a significant range boost. Owner feedback indicates it is a popular upgrade for enduro racing and trail riding.
However, this tank is model-specific and may not fit your bike. Installation can be challenging, often requiring modifications to the radiator shrouds or seat. The cost is also higher than many auxiliary tanks. If you own a compatible bike and want a clean, integrated solution, this is a good option. Otherwise, a universal auxiliary tank may be more practical.
- Direct replacement for many dirt bike models
- Larger capacity than stock without adding a separate tank
- Includes petcock and mounting hardware
Pros: Integrates smoothly with bike's fuel system; No extra mounting required
Cons: Limited to specific bike models
Frequently Asked Questions
Are auxiliary fuel tanks safe for motorcycles?
Yes, when properly installed and used according to manufacturer guidelines. Look for tanks that meet DOT/EPA standards and include features like vented caps, anti-slosh baffles or foam, and secure mounting. Always ensure the fuel system is leak-free and that the tank does not interfere with the bike’s controls or suspension.
How do I install an auxiliary fuel tank on my motorcycle?
Installation varies by product. Most rigid tanks require mounting brackets or plates that attach to your bike’s frame, rack, or pannier mounts. Flexible bladders can be strapped to luggage or carried in a backpack. Always follow the manufacturer’s instructions and consider professional installation if you are not comfortable with mechanical work.
Can I use an auxiliary fuel tank with a fuel-injected motorcycle?
Yes, but you need to ensure compatibility. Some auxiliary tanks are designed for gravity-fed carbureted systems and may require a fuel pump or primer bulb for fuel-injected bikes. Check the product specifications and consult with the manufacturer if needed.
What size auxiliary fuel tank do I need?
Consider your bike’s fuel consumption and the distance you want to cover. A 1-2 gallon tank typically adds 50-100 miles of range. For long-distance touring, 3-5 gallons may be appropriate. Larger tanks add weight and affect handling, so balance range with practicality.
Will an auxiliary fuel tank void my motorcycle warranty?
It depends on the installation method and your bike’s warranty terms. Permanent modifications like drilling holes or splicing into the fuel system may void parts of the warranty. Portable tanks that do not modify the bike are less likely to cause issues. Check with your dealer before installing.
Our Verdict
After researching and comparing the best auxiliary fuel tanks for motorcycles, our top pick is the Rotopax 1.75 Gallon Fuel Pack for its outstanding durability, modular design, and safety features. It suits most riders who need a reliable range extender. For dual-sport and enduro riders on a budget, the Tusk 2.5 Gallon Enduro Fuel Tank offers excellent value and performance.
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