The Best Auxiliary Fuel Tanks for Gasoline, Tested

If you’re looking to extend your vehicle’s range or need a reliable solution for small engine work, choosing the right auxiliary fuel tank is essential. Whether for heavy-duty applications, hobbyist tuning, or emergency backup, the best auxiliary fuel tank can make a significant difference in your operations.

This guide explores some of the top options available on Amazon, examining their features, advantages, and ideal use cases, to help you make an informed purchase tailored to your needs.

Porotmotor Motorcycle Auxiliary Fuel Tank – Precise Tuning and Small Engine Support

The Porotmotor Motorcycle Auxiliary Fuel Tank is designed primarily for small engine work and carburetor tuning, making it an essential tool for mechanics and hobbyists alike. Its compact 500ml capacity allows you to test engines without risking spillage or contamination, providing a controlled environment for fine adjustments.

Equipped with a vent and a clear scale, this auxiliary tank enables precise fuel flow management, giving you the ability to bypass the main tank and deliver clean fuel directly to your carburetor. Its versatile mounting options, including hanging it on a handlebar or bench vice, enhance ease of use and safety during engine maintenance. Crafted from durable materials, this auxiliary tank ensures long-lasting performance, even in demanding garage environments.

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• 【Essential Tool for Small Engine Work and Carburetor Tuning】 The Motorcycle Auxiliary Fuel Tank (500ml with Vent) is an indispensable tool for small engine work and carburetor tuning. It enables the testing of engines before final assembly and offers a convenient solution for precise carburetor adjustments.
• 【Versatile Usage and Precise Control】 With its ability to bypass the tank and deliver clean fuel directly to the carburetor, this auxiliary tank is a valuable tool for working on motors. It enables accurate carburetor adjustments and tuning, thanks to the valve and scale lines that allow you to control the flow of fuel.
• 【Convenient and Safe Design】 This auxiliary tank is designed for easy access and control during engine work, allowing you to securely hang it on the handlebar or bench vice. By using this tank, you can eliminate the risk of accidentally dropping your main fuel tank, creating a safer working environment. Additionally, the fuel tank is equipped with an air inlet on the cap to ensure balanced internal and external air pressure for reliable and smooth gasoline flow.
• 【Durable and Reliable Garage Tool】 Crafted from high-quality materials, this auxiliary tank is durable and reliable. It serves as an essential tool for maintenance and repairs, making it a dependable choice for garage use. Its durability ensures long-lasting performance and reliable fuel delivery.
• 【Note】Before adding fuel to the auxiliary fuel tank, please ensure to follow these precautions: 1.Verify valve closure: Double-check that the fuel valve is tightly closed before adding fuel. This prevents any fuel from flowing out or leaking during the refueling process. 2. Check connection clamps: Inspect all connection points between the auxiliary fuel tank and the equipment. Ensure that any clamps or fasteners are securely tightened to prevent fuel leaks or disconnections while adding fuel. 3.Any problem please contact us, we will give you a satisfactory solution!

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RDS MFG INC 60-Gallon Fuel Tank – Large Capacity for Heavy-Duty Applications

The RDS MFG INC 60-Gallon Fuel Tank is a substantial auxiliary fuel solution designed for trucks, generators, and other heavy equipment. Its large capacity minimizes refueling stops during long operations, ensuring your machinery stays powered for extended periods.

This tank can be siphoned using an electric pump, allowing for efficient transfer of gasoline from the top. While it fits some short beds and offers versatile dimensions, it’s important to measure your vehicle before purchasing. Its robust construction ensures durability in rugged environments, making it suitable for industrial and agricultural use.

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• RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs
• Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump
• Fits some short beds; please measure before ordering
• Cannot be used to transfer gasoline to another vehicle

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RDS MFG INC 71083 Rectangular Auxiliary/Transfer Tank – Versatile and Rust-Free

The RDS MFG INC 71083 is a 45-gallon rectangular auxiliary tank made from aluminum, providing excellent resistance to rust and corrosion. Its welded seams enhance durability, making it suitable for demanding environments where longevity matters.

This tank is ideal for auxiliary fueling and transfer tasks, especially when siphoning with an electric pump. Its shape allows for easy installation in various vehicle types, and its corrosion-resistant material ensures reliable operation over time, even in challenging conditions.

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• RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs
• Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump
• Fully welded seams for durability
• Aluminum Tank – NO RUSTING

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RDS MFG INC 37-Gallon Auxiliary Fuel Tank – Compact and Efficient

The RDS MFG INC 37-gallon auxiliary tank offers a compact yet efficient solution for additional fuel storage. Its size makes it a versatile choice for smaller trucks, utility vehicles, or custom setups where space is limited.

Compatible with electric siphon systems, this tank allows for quick refueling or transfer of gasoline, making it suitable for various field applications. Its straightforward design emphasizes durability and ease of use, ensuring dependable fuel delivery when needed.

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• RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs
• Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump
• Product Type – MOTOR ENGINE FUEL TANK
• Item Package Quantity – 1

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KAFLLA 51-Gallon Aluminum Fuel Transfer Tank Toolbox Combo – Heavy-Duty and Portable

The KAFLLA 51-gallon aluminum transfer tank combines a rugged fuel tank with an integrated toolbox, making it ideal for professional and heavy-duty use. Its heavy-duty aluminum construction resists rust, corrosion, and weather, ensuring long-term performance.

Equipped with a high-efficiency 10 GPM 12V DC fuel pump, a 13-foot hose, and an automatic shut-off nozzle, this system allows fast, spill-free refueling in the field. Its portable design and secure mounting make it suitable for trucks, construction sites, or agricultural operations where quick access to fuel is critical.

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• Heavy-Duty Aluminum Fuel Tank & Toolbox Combo: Built from rugged black aluminum, this 51-gallon fuel transfer tank toolbox combo resists rust, corrosion, and harsh weather. Designed for truck beds, it securely stores fuel and tools in one compact, space-saving unit—ideal for demanding work environment
• High-Efficiency 10 GPM 12V DC Fuel Pump: Equipped with a 10 GPM 12V DC fuel transfer pump, this system delivers fast, reliable refueling wherever you work. The 13 ft hose and automatic shut-off nozzle ensure smooth, spill-free fuel transfer for gasoline or diesel
• Large 51-Gallon Auxiliary Fuel Capacity: The 51-gallon auxiliary fuel tank provides ample onboard fuel storage, reducing downtime and refueling trips. Perfect for field refueling trucks, generators, tractors, and heavy equipment when access to fuel stations is limited
• Safe, Portable & Easy to Use: Designed for convenience, this portable fuel transfer tank connects directly to a vehicle or standalone 12V battery. The integrated pressure relief design helps maintain tank integrity during operation, improving safety and reliability on the job
• Versatile Fuel Compatibility for Work & Field Use: Compatible with gasoline and diesel, this truck bed fuel tank is a dependable solution for construction sites, farms, fleets, and off-road equipment. Built for intermittent-duty operation to extend pump life

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RDS MFG INC 69-Gallon Rectangular Auxiliary Tank – High Capacity and Durability

The RDS MFG INC 69-gallon auxiliary tank offers a high-capacity solution for extensive fueling needs. Its rectangular shape allows for easy fitting in compact spaces, making it suitable for trucks and utility vehicles.

Constructed with fully welded seams, this aluminum tank ensures durability and resistance to leaks or damage. It can be siphoned using electric pumps, providing a flexible fueling option for various applications, from farming to construction.

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• RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs
• Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump
• Package Dimensions: 57.0 " L x 18.0 " W x 16.0 " H
• Package Weight: 43.545 kilograms

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RDS MFG INC 72548 60-Gallon Fuel Transfer Tank & Toolbox – Multi-Function Utility

The RDS MFG INC 72548 combines a 60-gallon auxiliary fuel tank with a toolbox, offering a multi-purpose solution for fieldwork and vehicle maintenance. Its sturdy construction and design facilitate easy installation and reliable fuel transfer.

Perfect for trucks or service vehicles, this system supports electric siphoning, ensuring quick refueling. Its comprehensive design helps reduce downtime and keeps tools and fuel together for convenience and efficiency.

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• Product Type:Auto Accessory
• Item Package Dimension:53.34 Centimeters L X 53.34 Centimeters W X 142.24 Centimeters H
• Country Of Origin: United States
• Item Package Weight:54.431 Kilograms

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BLACKHORSE-RACING 51-Gallon Aluminum Transfer Tank & Toolbox – Heavy-Duty and Efficient

The BLACKHORSE-RACING 51-gallon aluminum transfer tank pack features a robust design suitable for demanding environments. Its corrosion-resistant black aluminum body ensures longevity and resilience against the elements.

With a 10 GPM pump, 13-foot hose, and automatic shut-off nozzle, it provides fast, spill-free refueling for gasoline or diesel. The integrated toolbox offers additional storage, making it practical for trucks or off-road vehicles that need quick access to fuel and tools.

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• Strong Material- The fuel transfer tank toolbox combo is made of black aluminum,which is durable, rust & corrosion-resistant. It comes with a key and can be used immediately after opening. It is a reliable and convenient fuel transfer tool
• High Efficiency Pump Performance- 10GPM 12V DC fuel pump on the drive side with automatic refueling nozzle and 13.1ft hose for fast refueling(The package does not contain a filter)
• Perfect Packaging- The patented all-foam cover forms a rigid wall between the outer aluminum layers to help prevent the tank from bending or warping
• Capacity- 51 Gallons auxiliary fuel tank size -50'L x 19'W x 21'H, large enough fuel storage capacity to carry diesel or gasoline, top toolbox-31'L x 19'W x 8.8'H,the toolbox is large enough to carry other items you need to carry
• Automatic Refueling Nozzle- The nozzle is made of high-quality aluminum alloy and PVC material, and stops the fuel flow after filling the oil tank,effectively preventing fuel overflow and improving the safety of refueling
• Attention! The package contains a general instruction manual for the pump, which is for reference only. The actual accessories received will be the final ones

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RDS MFG INC 71791 91-Gallon Rectangular Transfer Tank – High Volume and Durable

The RDS MFG INC 71791 is a 91-gallon rectangular tank designed for extensive fuel transfer needs. Its fully welded aluminum construction guarantees long-lasting durability and resistance to corrosion.

Suitable for various vehicles, especially those with short beds, this tank offers a flexible solution for large-scale fueling operations. It does not include a pump, so pairing it with an electric siphon is recommended for ease of use.

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• RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs
• Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump
• Item contains only tank, no pick up tube, pump, hose or nozzle
• Fits some short beds; measure before ordering

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Buyer’s Guide: What to Consider

Choosing the right auxiliary fuel tank involves considering various practical factors that align with your specific needs. From capacity and material to safety and ease of use, each aspect influences your overall experience and efficiency.

• Capacity: Determine your fuel needs based on the scope of your projects or vehicle usage to choose an appropriately sized auxiliary tank.
• Material: Opt for corrosion-resistant materials like aluminum or high-grade steel to ensure longevity, especially if operating in harsh environments.
• Compatibility: Check if the tank fits your vehicle’s dimensions and mounting points, and whether it supports your preferred fueling method, such as electric siphons or manual transfer.
• Pump and Transfer Features: Consider tanks with built-in pumps or compatibility with electric pumps for quick, spill-free refueling, especially in field conditions.
• Durability and Construction: Look for welded seams, weather-resistant coatings, and sturdy construction to ensure your tank withstands frequent use and rough handling.
• Safety Features: Features like pressure relief valves, secure mounting options, and spill-proof nozzles improve safety during operation.
• Additional Features: Integrated toolboxes, vents, and ease of access can enhance usability and convenience, especially for professional applications.

Conclusion

In summary, the best auxiliary fuel tank for gasoline depends on your particular application—whether you require a compact tool for small engine tuning or a large capacity solution for industrial use.

Assess your operational needs carefully, considering capacity, durability, compatibility, and safety features, to select a tank that ensures reliable performance and safety in your work environment.