Best Auxiliary Fuel Tank: Practical Features for Easier Everyday Use

A strong auxiliary fuel tank delivers the capacity, vehicle fit, and fuel-handling setup your motorcycle, truck, van, or service project requires. The products here range from 300 ml workshop containers for carburetor servicing to 69-gallon aluminum tanks designed for vehicle-mounted auxiliary use. Truck owners can choose rectangular, wedge, or toolbox-combo designs, while motorcycle users have compact plastic or nylon tanks with hoses and valves.

The key decision is not simply capacity: dimensions, material, connection method, and stated compatibility determine whether a tank suits your vehicle and routine. Check the listed fuel type and installation requirements carefully, especially where gravity feed, an electric pump, or a separate diesel installation kit is involved.

The best auxiliary fuel tank depends on the job. For motorcycle carburetor servicing, the TAURISH 300 ml tank and PRAZTECH 300 ml tank provide compact capacities with hoses or a fuel tap. For extended motorcycle travel, the 1-liter WINTOWIN includes a hose, cutoff valve, lid, and air outlet.

Truck users have larger aluminum or steel options, including RDS tanks from 45 to 69 gallons, the 63-gallon RDS wedge, and the 42-gallon Dee Zee tank. Confirm dimensions, vehicle compatibility, and fuel-transfer method before choosing.

Auxiliary Fuel Tanks: Features Compared

Image	Product	Buy
Best Pick 1	Auxiliary Fuel Tank Workshop Tool Balancing Carbs Carburettor Best for: Carburetor Balancing Brand: TAURISH | Capacity: 300 ml	View on Amazon
Best Pick 2	RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon Best for: Large Capacity Storage Brand: RDS MFG INC | Capacity: 69 gallons	View on Amazon
Best Pick 3	RDS MFG INC – 72548 Fuel Transfer Tank/Auxiliary Fuel Tank/Toolbox Combo – 60 Gallon Best for: Combined Tank & Toolbox Brand: RDS MFG INC | Capacity: 60 gallons	View on Amazon
Best Pick 4	11025 Diesel Installation Kit Auxiliary Fuel Tank Install Kit for Diesel Best for: Diesel Installation Brand: JURPLIX | Compatible with Vehicle Type: Truck	View on Amazon
Best Pick 5	Auxiliary Gas Fuel Tank Universal Motorcycle Gas Tank Repair Tool Kit Auxiliary Fuel Tank 1L with Fuel Hose,Cut Off Valve and Lid with Air Outlet Best for: Motorcycle Gas Repair Brand: WINTOWIN | Capacity: 1 liters	View on Amazon

How We Compared These Products

We compared dimensions, capacity, materials, compatibility, included components, and care requirements across many Amazon listings. These details matter because the product must fit the available space, intended use, setup requirements, and maintenance routine. After examining the wider field, we selected 10 products from TAURISH, RDS MFG INC, JURPLIX, WINTOWIN, PRAZTECH, RALZAOTO, and DEE ZEE.

The shortlist includes products such as TAURISH Auxiliary Fuel Tank Workshop Tool Balancing Carbs Carburettor, RDS MFG INC Rectangular Auxiliary Fuel Tank, and JURPLIX 11025 Diesel Installation Kit Auxiliary Fuel Tank Install Kit for Diesel. Every recommendation is tied to information stated for that specific product; unclear or missing features were treated as unknown rather than filled with assumptions.

Detailed Reviews: Best Auxiliary Fuel Tank

1. Auxiliary Fuel Tank Workshop Tool Balancing Carbs Carburettor

Best for: Motorcycle Carburetor Tuning.

This 300ml auxiliary fuel tank is a must-have tool for DIY servicing and carburetor balancing on motorcycles. Its compact size and clear measuring lines make precise fuel delivery easy. The included on/off fuel tap offers convenient control during maintenance.

Designed for motorcycle servicing, this 300ml plastic tank allows access to the engine and carburetors when the main fuel tank is removed. It features embossed fuel increment measuring lines for accuracy and an on/off fuel tap for controlled operation. Its capacity is ideal for tuning and balancing tasks.

Product Details

Pros

• Essential for carburetor balancing
• Clear fuel increment measuring lines
• Includes on/off fuel tap
• Compact 300ml capacity

Cons

• Small capacity may require frequent refills for larger tasks.

Ideal for DIY motorcycle mechanics needing a dedicated tool for tuning and carburetor work. Ensure its 300ml capacity is sufficient for your specific servicing needs.

2. RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon

Best for: Large Capacity Diesel Transfer.

This 69-gallon rectangular auxiliary fuel tank from RDS MFG INC is constructed from aluminum for durability. It supports gasoline auxiliary fueling via an electric fuel pump siphoning from the top, offering a substantial capacity for extended operations.

Constructed from aluminum, this 69-gallon tank is designed for auxiliary fueling of gasoline using an electric pump. Its large dimensions (57" L x 18" W x 16" H) provide ample storage. Diesel fuel can be gravity-fed from the bottom, and an optional install kit is available for diesel systems.

Product Details

Pros

• Generous 69-gallon capacity
• Durable aluminum construction
• Supports gasoline fueling via pump
• Allows diesel gravity feed

Cons

• Requires an electric pump for gasoline siphoning.

Suitable for users needing a large-volume aluminum auxiliary tank for gasoline or diesel transfer. Verify compatibility with your specific fueling setup and vehicle type.

3. RDS MFG INC – 72548 Fuel Transfer Tank/Auxiliary Fuel Tank/Toolbox Combo – 60 Gallon

Best for: Truck Diesel Transfer with Toolbox.

This 60-gallon RDS MFG INC auxiliary fuel tank and toolbox combo offers a versatile solution for trucks. Constructed from a durable alloy steel, aluminum, and stainless steel blend, it provides robust storage and fuel transfer capabilities.

This 60-gallon auxiliary fuel tank, made from a blend of alloy steel, aluminum, and stainless steel, is designed for truck applications. It allows for diesel fuel to gravity feed from the bottom, and an optional diesel install kit can be purchased. It also integrates a toolbox for added utility.

Product Details

Pros

• Combined fuel tank and toolbox
• Durable alloy steel, aluminum, stainless steel construction
• 60-gallon capacity
• Supports diesel gravity feed

Cons

• Requires an optional kit for diesel installation.

A practical choice for truck owners needing both fuel storage and tool organization. Ensure this 60-gallon unit fits your truck bed dimensions and intended use.

4. 11025 Diesel Installation Kit Auxiliary Fuel Tank Install Kit for Diesel

Best for: Diesel Truck Installation Kit.

This JURPLIX 11025 diesel installation kit provides all necessary components for auxiliary fuel tank setup in compatible trucks. It includes a fuel hose, shut-off valve, roll-over valve, and aluminum tee for a complete installation.

Designed for specific Dodge, Ford, Chevy, and GMC diesel trucks from various model years, this kit includes essential parts like a fuel hose, shut-off valve, roll-over valve, and an aluminum tee. It also comes with clamps and PTFE tape for secure assembly, ensuring a functional fuel system.

Product Details

Pros

• Comprehensive installation components included
• Compatible with multiple popular diesel trucks
• Durable aluminum tee construction
• Includes shut-off and roll-over valves

Cons

• Does not include the auxiliary fuel tank itself.

Essential for owners of compatible diesel trucks looking to install an auxiliary fuel tank. Confirm your truck model and year match the specified fitment before purchasing.

5. Auxiliary Gas Fuel Tank Universal Motorcycle Gas Tank Repair Tool Kit Auxiliary Fuel Tank 1L with Fuel Hose,Cut Off Valve and Lid with Air Outlet

Best for: Motorcycle Carburetor Sync Tool.

This 1-liter universal auxiliary fuel tank from WINTOWIN is a portable essential for synchronizing motorcycle carburetors. Made from ABS material, it features a clear scale, easy-refuel filler cap, and a solid brass petcock control valve.

The 1-liter auxiliary tank, constructed from ABS with a clear scale, aids in carburetor synchronization and extended travel for motorcyclists. It measures L40 × W115mm and weighs 266g, making it lightweight and portable. A solid brass petcock valve and a 108cm hose facilitate convenient operation.

Product Details

Pros

• Aids in carburetor synchronization
• Portable and lightweight design
• Includes brass petcock control valve
• Generous 1-liter capacity

Cons

• Hose length may be limiting for some setups.

Perfect for motorcycle riders needing a portable fuel source for carburetor tuning or extended trips. Ensure the 108cm hose length is adequate for your motorcycle's configuration.

6. Royal Vintage Spare A112 Auxiliary Fuel Tank For Servicing Your Bike 300Ml

Best for: Bike Servicing Fuel Holder.

This 300ml auxiliary fuel tank from PRAZTECH is designed for servicing bikes, providing a convenient way to hold fuel during maintenance. It includes a flexible rubber pipe and a nylon strap for secure attachment.

The 300ml auxiliary fuel tank, made from nylon and rubber, is ideal for bike servicing. It holds up to 300ml of fuel and features a 35-inch flexible rubber pipe for easy fuel delivery. The 17-inch nylon strap allows for secure mounting during maintenance tasks.

Product Details

Pros

• Convenient for bike servicing
• Includes flexible rubber pipe
• Secure nylon strap attachment
• 300ml fuel capacity

Cons

• Nylon strap length might be insufficient for some frames.

A practical accessory for bike mechanics needing a small, portable fuel holder for servicing. Verify the 17-inch nylon strap length is suitable for your bike's frame.

7. Auxiliary Fuel Tank Install Kit Diesel Installation Kit 11025

Best for: Diesel Truck Install Kit.

This RALZAOTO 11025 diesel installation kit is crafted from high-quality aluminum and rubber for corrosion resistance and longevity. It ensures a stable gravity fuel supply for compatible diesel trucks, allowing for controlled fuel levels.

Made from aluminum and rubber, this diesel installation kit is compatible with Ford, Chevy/GMC, and Dodge diesel trucks from various model years. It provides a stable gravity fuel supply, enabling control over the fuel level from the OE tank. Its durable construction ensures a long service life.

Product Details

Pros

• Durable aluminum and rubber construction
• Provides stable gravity fuel supply
• Compatible with multiple diesel truck brands
• Corrosion-resistant materials

Cons

• Only compatible with diesel engines.

An excellent choice for owners of compatible diesel trucks seeking a reliable installation kit. Ensure your vehicle is diesel-powered and matches the specified compatibility range.

8. Dee Zee DZ92556NSB Transfer Tank

Best for: Heavy Duty Steel Transfer Tank.

The Dee Zee DZ92556NSB is a heavy-duty 14-gauge steel transfer tank with a 42-gallon capacity, protected by a black NRT rust inhibitor powder coat finish. Its radius curve design eliminates weld pressure points for enhanced durability.

This 42-gallon (128 liters) steel transfer tank features stability baffles to reduce sloshing and mounting tabs for secure attachment in a truck bed. The radius curve design enhances structural integrity by eliminating weld pressure points. It includes a drain plug and a lockable cap for security.

Product Details

Pros

• Robust 14-gauge steel construction
• 42-gallon capacity
• Rust-inhibiting powder coat finish
• Stability baffles reduce sloshing

Cons

• Not suitable for flammable liquids.

Ideal for transporting non-flammable liquids in heavy-duty applications, this 42-gallon steel tank offers durability and security. Confirm its dimensions fit your truck bed and intended cargo.

9. RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank – 45 Gallon Capacity

Best for: Rust-Proof Aluminum Transfer Tank.

This 45-gallon rectangular auxiliary/transfer fuel tank from RDS MFG INC is constructed from aluminum with fully welded seams for superior durability and rust prevention. It is designed to fit various needs and capacities.

Constructed from aluminum, this 45-gallon tank features fully welded seams, ensuring no rusting and enhanced durability. It supports gasoline auxiliary fueling by siphoning from the top using an electric fuel pump. Diesel fuel can be gravity-fed from the bottom, and an optional diesel install kit is available.

Product Details

Pros

• Rust-proof aluminum construction
• Fully welded seams for durability
• 45-gallon capacity
• Supports both gasoline and diesel fueling methods

Cons

• Requires an electric pump for gasoline siphoning.

A durable, rust-proof aluminum option for those needing a 45-gallon auxiliary fuel tank for gasoline or diesel. Verify compatibility with your vehicle and fueling system requirements.

10. RDS MFG INC 71783 Auxiliary Fuel Tank 63Gal Wedge

Best for: Wedge Style Aluminum Fuel Tank.

This 63-gallon RDS MFG INC auxiliary fuel tank features a wedge design and is constructed from aluminum for durability and corrosion resistance. It is compatible with cars, trucks, and vans, offering substantial fuel capacity.

The 63-gallon aluminum wedge tank is designed for cars, trucks, and vans, providing substantial auxiliary fueling capacity. Its aluminum construction ensures it will not rust, and the wedge shape may offer specific fitment advantages. Diesel fuel can be gravity-fed from the bottom, with an optional install kit available.

Product Details

Pros

• Large 63-gallon capacity
• Durable, rust-proof aluminum construction
• Wedge design for specific fitments
• Supports diesel gravity feed

Cons

• Requires an optional kit for diesel installation.

A high-capacity aluminum tank suitable for trucks, cars, and vans needing extended fuel range. Consider the wedge design's fitment and ensure an optional kit is used for diesel applications.

What Buyers Often Overlook

Capacity and format: service tank or vehicle-mounted reserve

Choose a compact service tank when the goal is temporary fuel supply during maintenance rather than carrying a large reserve. The TAURISH and PRAZTECH models each hold 300 ml, while the WINTOWIN holds 1 liter and includes a 108 cm hose, cutoff valve, lid, and air outlet. These capacities suit motorcycle-related servicing or limited auxiliary use, but they are not comparable to truck-bed tanks.

For larger vehicle applications, the listed choices span 42 gallons for the Dee Zee, 45 gallons for the RDS 71083, 60 gallons for the RDS toolbox combo, 63 gallons for the RDS wedge, and 69 gallons for the RDS rectangular tank. Larger capacity also brings substantial size and weight considerations: the RDS 69-gallon model measures 57 by 18 by 16 inches, while the 63-gallon wedge measures 52 by 19 by 18 inches.

Match capacity to available space and the intended transfer setup.

The Key Product Trade-Off

Fit, material, and transfer method determine compatibility

The correct tank must match the vehicle, available mounting space, material preference, and stated fuel-transfer method. The RDS and Dee Zee products are intended for larger vehicle applications, with aluminum RDS models offering no-rust construction claims and the Dee Zee using 14-gauge steel, stability baffles, mounting tabs, and a drain plug. RDS descriptions state that diesel can gravity-feed from the bottom with an optional diesel installation kit, while gasoline auxiliary fueling is allowed only when siphoned from the top using an electric fuel pump.

The JURPLIX and RALZAOTO 11025 kits are truck-focused diesel installation kits with hoses, valves, clamps, and related fittings; JURPLIX lists compatibility with specific Ford, Chevrolet, GMC, and Dodge applications. The RDS 71783 is listed for cars, trucks, and vans, but dimensions still need checking.

Do not assume a universal fit from a product category label alone.

Best Auxiliary Fuel Tank: Buyer's Guide

Fit, Dimensions, and Compatibility

Compare the listed dimensions with the intended counter, cabinet, appliance, storage, or installation space. Confirm model compatibility and connection requirements where they are supplied. A useful feature cannot compensate for a product that does not physically fit or work with the buyer’s existing setup.

Capacity, Output, and Operating Format

Match listed capacity, volume, output, and operating mode to the actual household or work routine. Larger figures can support heavier use, while a smaller format may be easier to place and maintain. Treat daily output, immediate storage, and container capacity as separate specifications when the listing distinguishes them.

Materials, Construction, and Care

Use the listed materials and care instructions to judge cleaning effort, storage conditions, and compatibility with the intended use. Dishwasher, freezer, food-contact, or weather-related claims are included only when supplied for that product. Check whether routine care fits the way the product will be used.

Included Components and Setup Needs

Review the included components before planning installation or first use. Hoses, adapters, lids, paddles, bowls, brushes, controls, and manuals vary by listing. Confirm power, water, assembly, or accessory requirements from the supplied product information rather than assuming that separately pictured parts are included.

Which Should You Choose?

Choose a 300 ml TAURISH or PRAZTECH tank for motorcycle or carburetor servicing where portability matters more than reserve capacity. Select the 1-liter WINTOWIN when a motorcycle user needs a larger compact container with a hose, cutoff valve, lid, and air outlet. For a truck-bed auxiliary or transfer setup, compare the 45-gallon RDS 71083, 69-gallon RDS rectangular tank, 63-gallon RDS wedge, and 60-gallon RDS toolbox combo by dimensions and available space.

The Dee Zee 42-gallon steel tank adds baffles, mounting tabs, a drain plug, and a lockable-cap description. If the vehicle is a listed diesel truck application, compare the JURPLIX and RALZAOTO 11025 installation kits and verify the part number before fitting.

Quick Buying Checklist

• Confirm the complete dimensions against the available space.
• Verify model, accessory, connection, and appliance compatibility.
• Match capacity or output to the expected amount of use.
• Compare materials and care instructions with the maintenance routine.
• Check the included components before planning setup or first use.
• Confirm listed power, water, storage, or installation requirements where applicable.

Frequently Asked Questions

What is the primary function of an auxiliary fuel tank?

An auxiliary fuel tank supplements your vehicle’s main fuel supply, extending range or providing fuel for specific applications like generators or auxiliary engines. They are often used in trucks, RVs, and specialized vehicles to increase operational time between refuels.

Are auxiliary fuel tanks universal for all vehicle types?

No, auxiliary fuel tanks are not universally compatible. While some are designed for general use, many are vehicle-specific or application-specific, such as diesel installation kits or motorcycle repair tanks. Always check compatibility for your particular vehicle and intended use.

What materials are commonly used for auxiliary fuel tanks?

Auxiliary fuel tanks are typically constructed from durable materials like aluminum or high-density polyethylene (HDPE). These materials offer resistance to corrosion and fuel degradation, ensuring longevity and safety for fuel storage and transfer applications.

Can an auxiliary fuel tank be used for different fuel types?

It is crucial to use an auxiliary fuel tank designed for the specific fuel type. Using a tank intended for diesel with gasoline, or vice-versa, can lead to contamination, engine damage, and safety hazards. Always match the tank to the fuel.

What are the benefits of a combined fuel tank and toolbox?

A combined fuel tank and toolbox offers convenience by consolidating storage for both fuel and tools in one unit. This is particularly useful for work vehicles or mobile service setups, saving space and streamlining operations by keeping essential items together.

Final Words

Selecting the right auxiliary fuel tank depends on your specific needs, whether it’s extending travel range, powering equipment, or facilitating vehicle maintenance. Consider capacity, material, and intended use, such as diesel or gasoline applications, to ensure optimal performance and safety.