Ameer Randolph
Building a motorcycle fuel tank from scratch can be a challenging task, but with careful planning and the right tools, it is achievable. The first step is to consider the design, capacity, and style of the tank to match the motorcycle's overall design and intended use. Material selection is crucial, with options including steel, aluminum, or copper, each requiring different techniques to shape and form. For steel, brute force may be employed, while aluminum may be softened with heat for easier manipulation. Creating a template and using tools like a shrinker/stretch machine and a planishing hammer can help shape the tank to the desired specifications. Safety considerations and final smoothing with an English wheel are also important steps in the process. Whether it's a one-off handmade creation or a mass-produced endeavor, building a motorcycle fuel tank can be a rewarding project for motorcycle enthusiasts.
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What You'll Learn
Design and material selection
The design and material selection of a motorcycle fuel tank depend on several factors, including the desired style, capacity requirements, functionality, and the methods used to hold the tank together.
For the material, you can choose between steel, aluminium, or copper. Steel is commonly used in 16 or 18 gauge and is shaped using force. Aluminium can be annealed with heat to make it more pliable and reduce brittleness. It is also important to consider the thickness of the material, as this will impact the construction of the tank and its weight.
If you want to weld the tank together, it is advisable to minimise the number of welds required. This can influence the design and shape of the tank. Additionally, the choice of material may be influenced by the intended use of the motorcycle. For example, if the bike is intended for track days, a lighter material such as 20-gauge steel may be preferred over heavier 18-gauge steel.
When designing the fuel tank, you should also consider the placement of the filler cap and neck, as well as the type of gas filler and petcock bung. The capacity of the tank should be appropriate for the intended use of the motorcycle and its riding conditions.
For those who are less skilled in metalworking, there are aftermarket build-your-own tank kits available that provide a variety of shells, tunnels, mounts, and bungs to create a custom tank without the need for advanced metalworking techniques.
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Cutting and shaping
The cutting and shaping process for a motorcycle fuel tank depends on the material you're using. If you're using steel, you'll need to use a planishing hammer and various dollies to form and shape the metal. For aluminium, you'll need to apply heat to soften the material and make it more pliable. This can be done using a shrinker/stretcher machine and a planishing hammer.
If you're using a pre-made tank as a base, you can cut and shape it to your desired specifications. For example, if you want to achieve the Frisco look, you can cut a 2-inch hole for the gas filler and weld it into place. If you find your tank is too tall, you can cut some length off the bottom.
For those creating a wooden template, you can use a forming bag and a mallet to shape the panels, before finishing off with a planishing hammer and dollies to ensure a perfect fit to your wooden pattern.
If you're using a fiberglass tank, you'll need to do some sanding and use a fiberglass gel to smooth out the surface. You can then use body putty to fill in any small imperfections.
It's important to consider the thickness of the material you're using, as this will impact the ease of cutting and shaping, as well as the final weight of the tank. For example, 18-gauge steel may be too heavy for a motorcycle fuel tank, so some builders opt for 20 or 22-gauge steel instead. However, thicker material may be easier to weld and less prone to leaks.
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$32.99
Welding and assembly
Welding and assembling a motorcycle fuel tank can be a complex process, and the specific steps may vary depending on the materials used and the desired design. Here is a step-by-step guide to welding and assembling a motorcycle fuel tank:
When it comes to welding and assembling a motorcycle fuel tank, there are several factors to consider, including the choice of materials, thickness, and welding technique. Here is a detailed guide to help you through the process:
- Material Selection: The first step is to choose the right material for your fuel tank. Common options include steel, aluminium, or copper. Each material has its own advantages and disadvantages in terms of weight, strength, and workability. For example, steel is strong but heavier, while aluminium is lighter and more malleable but may require annealing to reduce brittleness.
- Thickness and Gauge: Determine the appropriate thickness of the material. For steel, 16 or 18 gauge is commonly used, while for aluminium, you may want to consider thinner gauges like 20 or 22 to reduce weight. Thickness impacts the durability and capacity of your fuel tank.
- Tank Shape and Design: Decide on the shape and design of your fuel tank. This will influence the welding process, as certain shapes may require more complex welding techniques. Consider the style you want to achieve and the capacity needed for your motorcycle.
- Welding Technique: Welding is the primary method for joining the parts of your fuel tank together. Minimise the number of welds to simplify the process. For aluminium, gas welding can be challenging due to the risk of distortion, so other welding methods may be preferred. Ensure your welds are airtight to prevent leaks.
- Tools and Equipment: Gather the necessary tools and equipment for welding. This may include a welding machine, protective gear, and tools for shaping and forming the material, such as a shrinker/stretch machine and a planishing hammer. An English wheel may also be useful for final smoothing.
- Assembly Process: Create a template or use a pre-made one to assemble the tank. Mark and cut out the panels, tunnels, and bottom sections. Fit the pieces together, tack welding them into place to ensure proper alignment. Drill holes for components like the petcock and gas filler, and weld them securely in place.
- Finishing Touches: Once the structural welding is complete, finish welding the tank to ensure its integrity. Smooth and refine the surface using appropriate tools. Test the tank for leaks using water or other recommended methods before final coating and sealing.
- Coating and Sealing: Coat the inside of the tank with a suitable sealer to protect it from fuel and prevent leaks. Some sources suggest using paste wax or Saran Wrap for added protection. You may also need to coat the outside of the tank, depending on the material and desired finish.
Remember, safety should always be a priority when working with welding equipment and power tools. It is recommended to wear appropriate protective gear and work in a well-ventilated area. Additionally, always test your fuel tank for leaks before use to ensure a safe and reliable ride.
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Leak testing
Firstly, it is recommended to initially test for leaks using water. Fill the tank with water and observe for any visible leaks. This is a simple and effective method to identify any major leaks. Ensure you conduct a thorough inspection of the tank during this test.
After the initial water test, it is advisable to take your fuel tank to a radiator shop for professional leak testing. This step ensures that any minor leaks or potential problem areas are identified by experts.
Another method is to use compressed air. You can fill the tank with compressed air and submerge it in water. Any air bubbles escaping from the tank will indicate a leak. This method provides a more precise identification of leak locations.
It is also important to consider the fuel tank's fittings and connections. Ensure that the welds, filler cap, neck, and bungs are secure and properly sealed. Any small gaps or imperfections can cause leaks. Using a suitable sealant or coating on these areas can help prevent leaks and ensure a tight seal.
Additionally, some builders choose to coat the entire inside of the fuel tank with a sealant or liner as a precautionary measure. This extra layer of protection can provide peace of mind and ensure that your fuel tank is less likely to develop leaks over time.
Remember, leak testing is a crucial step in fabricating a motorcycle fuel tank. It ensures the safety and functionality of your handmade creation. By following these steps and conducting thorough inspections, you can identify and address any leaks before putting the fuel tank to use.
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Finishing and coating
Once you have fabricated your motorcycle fuel tank, you will need to finish and coat it. This process will depend on the material you have used.
If you have used steel, you will need to smooth it with an English wheel. If you have welded steel, you may need to dress the tank to remove any distortion. If you have used aluminium, you will need to anneal it to reduce brittleness. You can then use a planishing hammer to smooth out any remaining imperfections.
If you have used fiberglass, you will need to sand the shell and then apply a gel coat. You should then use a body putty to fill in any small imperfections. Finally, you will need to coat the inside of the tank with a sealer to protect the fiberglass from fuel.
It is important to test your fuel tank for leaks before use. You can do this by filling it with water or sending it to a radiator shop for testing.
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Frequently asked questions
You can use steel, aluminium, copper, or fiberglass.
You will need a die grinder, a planishing hammer, a shrinker/stretch machine, and an English wheel.
First, create a template for the bottom panels and cut out the impressions with a die grinder. Drill holes for the petcock and gas filler, and weld them into place. Finish welding the tank once all structural work is done.
