
When tuning a motorcycle, an auxiliary fuel tank is essential. This tool is used for carburetor adjustments and small engine work. The Porotmotor Motorcycle Auxiliary Fuel Tank is a popular option, with a 500ml capacity and a vent. It is designed for easy access and control, allowing users to hang it on the handlebar or bench vice. The ALPHA MOTO Professional Motorcycle Auxiliary Fuel Container is another option, which is compatible with all carbureted bikes. It features a brass valve and a hanger. When choosing a fuel tank, it is important to consider the capacity, material, and ease of use. Some users have reported issues with leaking, so it is crucial to verify valve closure and check connection clamps before use.
| Characteristics | Values |
|---|---|
| Brand | Porotmotor |
| Product Name | Motorcycle Auxiliary Fuel Tank |
| Volume | 500ml, 1L, 2L |
| Use | Small engine work and carburetor tuning |
| Additional Features | Delivers clean fuel directly to the carburetor, enables accurate carburetor adjustments and tuning, convenient and safe design |
| Precautions | Verify valve closure, check connection clamps |
| Material | Steel, aluminum, copper |
| Customer Feedback | Mixed reviews, some praise the product's convenience while others report issues with leaking |
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What You'll Learn

Fuel tank material
The material of a motorcycle fuel tank is an important consideration when tuning a motorcycle. The most common materials used for motorcycle fuel tanks are steel, aluminium, and copper. Each material has its own advantages and disadvantages, and the choice depends on factors such as style, capacity requirements, and functionality.
Steel fuel tanks are known for their durability and strength. They are resistant to punctures and leaks, making them a reliable option for motorcycle fuel tanks. However, steel is a heavier material, which can add significant weight to the motorcycle. This weight may be undesirable, especially for high-performance motorcycles where lightweight construction is prioritised.
Aluminium fuel tanks offer a lightweight alternative to steel. They provide the same level of durability but with a reduced weight, making them a popular choice for motorcycles where weight optimisation is crucial. Aluminium is also naturally resistant to corrosion, which can be beneficial for motorcycles exposed to varying weather conditions. However, aluminium is a softer metal and may dent more easily than steel.
Copper fuel tanks are known for their unique aesthetic appeal. They offer a distinct look with a rustic charm that some motorcycle enthusiasts favour. Copper is a relatively soft metal, so it can be easily shaped and customised to match the design lines of the motorcycle. However, copper is more susceptible to corrosion and may require additional treatments or maintenance to ensure its longevity.
When selecting a fuel tank material, it is essential to consider the method of construction. Welding is the most common approach, and minimising the number of welds can simplify the process. Additionally, ensuring that the chosen material can be securely welded is vital to prevent leaks and ensure the integrity of the fuel tank.
Auxiliary fuel tanks, often used for carburetor tuning and small engine work, are typically made of different materials than standard fuel tanks. These auxiliary tanks are designed to be portable and convenient, allowing for precise carburetor adjustments and engine testing. They often feature additional components, such as vents, valves, and clamps, to facilitate their specific functions.
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Tank capacity
For example, a motorcycle designed for long-distance touring may require a larger fuel tank to provide an extended range, whereas a bike designed for urban commuting may have a smaller tank to reduce weight and improve manoeuvrability. Additionally, the style and design lines of the motorcycle may dictate the shape and size of the fuel tank to ensure a cohesive overall appearance.
When hand-making a custom fuel tank, careful consideration must be given to the material used, its thickness, and the method of construction. Steel, aluminium, and copper are all potential options, each with its own advantages and disadvantages in terms of weight, durability, and ease of welding. Minimising the number of welds can simplify the construction process and improve the overall aesthetics of the tank.
In addition to the main fuel tank, some motorcycles may utilise auxiliary fuel tanks, also known as gas tanks or reserve tanks. These tanks are typically smaller and are used for specific purposes, such as carburetor tuning, small engine work, or fuel injection services. Auxiliary fuel tanks range in capacity from 500ml to 2L and offer precise control over fuel delivery, allowing for accurate carburetor adjustments and testing of engines before final assembly.
When choosing an auxiliary fuel tank, it is important to consider factors such as build quality, ease of use, and leak prevention. Some products may offer additional features, such as a vent, scale lines, or a convenient hanging design, to enhance their functionality and safety during use.
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Tank design
Another aspect of tank design is the method of construction and assembly. Welding is a common method for joining the tank components, and it is advisable to minimise the number of welds to simplify the process. It is also essential to consider how the tank will be held together, ensuring a secure and leak-proof assembly. O-rings, seals, and clamps play a vital role in preventing fuel leaks and ensuring a tight connection between the tank and the equipment.
When designing the fuel tank, it is crucial to incorporate features that ensure safe and convenient refuelling. This includes a fuel valve that is easy to open and close, preventing fuel leaks during refuelling. A hook mount or hanger can also be included in the design to facilitate easy setup and refuelling. Additionally, the fuel tank should be designed to minimise the risk of accidental spills or drops, creating a safer refuelling environment.
Auxiliary fuel tanks are also available as a convenient option for carburetor tuning and small engine work. These tanks are designed to deliver clean fuel directly to the carburetor, allowing for precise adjustments. They often feature valve and scale lines for controlling fuel flow and can be securely hung on the handlebar or a stepladder during use. Some auxiliary tanks come with clamps and hoses, while others may require additional purchases to ensure a proper fit with the motorcycle's fuel system.
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Safety considerations
Safety should be a key consideration when tuning a motorcycle's fuel tank. Here are some essential safety precautions to follow:
Use an Auxiliary Fuel Tank: When tuning or performing maintenance on a motorcycle, it is advisable to use an auxiliary fuel tank rather than the main fuel tank. This helps eliminate the risk of accidentally dropping or knocking over the main fuel tank, which could lead to fuel leaks and potential hazards.
Verify Valve Closure: Before adding fuel to an auxiliary fuel tank, always ensure that the fuel valve is tightly closed. This prevents fuel leaks or spills during the refueling process, reducing the risk of fire or injury.
Inspect Connection Clamps: It is crucial to inspect all connection points between the auxiliary fuel tank and the equipment. Securely tighten any clamps or fasteners to prevent fuel leaks or disconnections while handling fuel. Loose connections can lead to dangerous fuel spills.
Choose Appropriate Materials: When constructing a custom fuel tank, carefully consider the materials used. Steel, aluminum, or copper are common choices, each with its own advantages and disadvantages in terms of durability, corrosion resistance, and ease of welding.
Minimize Welds: If welding is the chosen method for assembling the fuel tank, aim to minimize the number of welds. Fewer welds can simplify the construction process and reduce potential weak points in the tank's structure, enhancing its overall integrity.
Follow Local Regulations: Stay informed about any local regulations or safety standards pertaining to motorcycle fuel tank modifications or maintenance. Adhering to these regulations ensures that your work complies with legal requirements and helps maintain safety standards within the industry.
By following these safety considerations, you can help ensure a safer tuning experience and reduce the risk of accidents or incidents related to the fuel tank and fuel handling.
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Auxiliary fuel tanks
One popular option is the Porotmotor Motorcycle Auxiliary Fuel Tank, which has a capacity of 500ml and comes with a vent. This auxiliary tank can be hung securely on the handlebar or a bench vice, providing easy access and control during engine tuning. Its valve and scale lines allow you to control the fuel flow precisely, making it a valuable tool for carburetor tuning. Before using this tank, ensure that the fuel valve is tightly closed and inspect all connection points to prevent fuel leaks.
Another option for an auxiliary fuel tank is offered by Kinetic Motorcycles. Their auxiliary gas tank kit is the first of its kind, featuring a precision laser-cut steel design fabricated in Texas. With this kit, you can build your own tank setup based on your specific needs, and even customise it with a laser-engraved heatshield. The 5-litre option typically yields 60-70 miles of extended range, while the 3-litre option provides a range of 45-55 miles.
While auxiliary fuel tanks can be extremely useful, it is important to note that some customers have reported issues with fuel leaks, especially at the seams of the tank. Therefore, it is essential to carefully inspect the tank and follow the necessary precautions before adding fuel to ensure a safe and satisfactory experience.
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Frequently asked questions
An auxiliary fuel tank is a tool used for carburetor tuning and small engine work. It can be used to test engines before final assembly and allows for precise carburetor adjustments.
The Porotmotor Motorcycle Auxiliary Fuel Tank is a 500ml tank that can be hung on a handlebar or stepladder. The ALPHA MOTO Professional Motorcycle Auxiliary Fuel Container is another option that is compatible with all carbureted bikes.
It is important to verify that the fuel valve is tightly closed before adding fuel to prevent leaks. All connection points should also be inspected, and clamps and fasteners should be securely tightened.
Common materials used for motorcycle fuel tanks include steel, aluminum, and copper. Welding is typically used to hold the tank together, and it is ideal to minimise the number of welds.











































