
Installing a fuel tank on a motorcycle is a complex task that requires careful planning and execution. It is important to prioritize safety at all times, as gasoline is highly combustible and dangerous. Before beginning the installation process, ensure that you have all the necessary tools and safety equipment, including a fire extinguisher. The first step is to drain the fuel from the old tank and remove it from the motorcycle. When installing the new fuel tank, it is crucial to determine the exact location and make precise measurements to ensure a proper fit. The process may involve drilling holes, connecting fuel lines, and securing the tank with mounting hardware. It is recommended to refer to manufacturer instructions or seek guidance from experienced professionals when installing a fuel tank on a motorcycle.
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What You'll Learn

Safety precautions
Safety should always be the top priority when installing a motorcycle fuel tank. Here are some detailed safety precautions to follow when installing a fuel tank on a motorcycle:
Personal Protective Equipment (PPE): It is important to wear the necessary protective gear when handling fuel to prevent accidents and safeguard your health. This includes eye protection, such as safety glasses, to shield your eyes from potential splashes or spills. Hearing protection is also crucial to safeguard your ears from the loud noises that may occur during the installation process. Additionally, wear gloves to prevent skin contact with gasoline, and consider flame-resistant clothing (FRC) to minimize the risk of fire hazards.
Work Area Preparation: Choose a well-ventilated work area that is away from ignition sources and potential fire hazards. Ensure that the motorcycle is stable and secure on a flat surface to avoid any accidental movements or tip-overs during the installation process. Clear the area of any unnecessary tools, equipment, or obstructions to prevent tripping hazards and create a safe workspace.
Fuel Handling: If you are draining the existing fuel tank, refer to local guidelines for proper disposal methods. Do not smoke or allow any open flames near the fuel, as this can lead to hazardous situations. Always use approved containers and portable fuel tanks to avoid leaks and spills. Keep a fire extinguisher nearby in case of any accidental ignition.
Tool Usage: Utilize the correct tools for the installation, such as wrenches, screwdrivers, and, if necessary, a fuel line disconnect tool. Ensure you are confident in using these tools and follow the "measure twice, drill once" mantra to avoid mistakes. If you are welding, ensure you have the appropriate safety equipment and training.
Post-Installation Checks: Once the fuel tank is installed, conduct a thorough inspection to ensure there are no leaks. Check all connections, hoses, and fittings for any signs of fuel leakage. Be meticulous during this process to avoid potential hazards during the first ride after installation.
By following these safety precautions, you can ensure that the installation of your motorcycle fuel tank is done securely and efficiently, minimizing the risk of accidents or mishaps.
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Removing the old fuel tank
First, secure your motorcycle on a kickstand, lift or wheel stands so that it is stable and won't tip over while you work on it. Next, remove the fuel. This will make the process safer and easier. You can do this by running it down or siphoning it out. If you want to keep the fuel, you can drain the tank with a hose and container. You can also pull the fuel lines off the carb and keep them pointed up, or kink the hose with a zip tie.
Now, remove the fairings and the seat. Disconnect any tank straps and tank bolts, but leave the tank in place. You might need to access connections beneath it. Typically, most tanks will have bolts at both the front and rear of the unit.
Finally, disconnect the fuel pump and clear gas lines. The fuel lines within your fuel system are pressurised, so you need to relieve that pressure before disconnecting any hoses. To do this, unplug the connector for your fuel pump. This might be located underneath the seat, tank or on the sides. Once the fuel pump is unplugged, turn the motorcycle on and hold the start button for a few seconds.
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Choosing a new tank
The next important consideration is the compatibility of the new tank with your motorcycle. Ensure that the tank you choose is specifically designed for your motorcycle model and year. This includes considering the physical dimensions of the tank, such as its height and width, to ensure it fits seamlessly within the frame of your bike. Additionally, take into account the fuel capacity of the new tank. If you're opting for a larger tank, be mindful of the weight distribution and how it may impact the handling of your motorcycle.
When choosing a new tank, pay attention to the materials used in its construction. Common materials include plastic and metal, each with its own advantages and disadvantages. Plastic tanks are often lightweight and resistant to static electricity buildup, but may not be as durable as metal tanks. Metal tanks, on the other hand, can offer a more classic or stylish look, but may be heavier and require careful consideration of fuel expansion and ventilation.
It is also essential to prioritize safety when selecting a new fuel tank. Choose a tank that is specifically designed for carrying fuel to minimize the risk of leaks and fumes. Look for features such as secure fasteners, leak-proof designs, and ventilation mechanisms to accommodate fuel expansion during temperature changes. Additionally, consider the location of the new tank on your motorcycle, keeping it away from the exhaust system to prevent any potential safety hazards.
Lastly, consider the installation process of the new tank. Opt for tanks that are easy to install, with clear instructions and readily available hardware. Some tanks may require additional accessories or modifications to ensure a secure fit, so factor those potential costs into your decision. By following these guidelines and considering your specific needs, you can make an informed choice when selecting a new fuel tank for your motorcycle.
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Installing the new tank
Installing a new fuel tank on your motorcycle is a delicate procedure that requires careful preparation. Before you begin, ensure you have all the necessary tools and safety equipment. It is crucial to work in a well-ventilated area, free from clutter and any sources of flame or spark, such as pilot lights. Keep a fire extinguisher nearby as a safety precaution.
Start by draining the fuel from your old tank. If your tank has a drain cock, use it to empty the fuel into a suitable container. If not, you will need to remove one of the fuel lines—typically the rubber hose exiting the tank at its lowest point—and allow the fuel to drain into a receptacle. Once the tank is empty, disconnect all the fuel lines. Be cautious, as some fuel may remain in the lines.
Now you are ready to install the new tank. Place the new tank on the frame, securing it to the motorcycle. Test the fit by installing the seat and ensuring there is no interference with the handlebars or risers. Connect the fuel lines to the new tank, following the reverse steps of the removal process. Reattach any mounting brackets or hardware that were removed from the old tank, ensuring they are secure.
Before refilling the tank with fuel, it is recommended to test the setup by adding a small amount of fuel and checking for any leaks. If no leaks are detected, you can fill the tank and enjoy your upgraded fuel capacity.
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Testing for leaks
One method to test for leaks is to fill the tank with fuel and observe any stains or signs of fuel leakage. Prop the tank up on a workbench and look for any fuel stains or drips, which can indicate a weld seam leak. If the fuel stain is above the carb, it is likely that the petcock gasket is faulty, causing fuel to leak out and drip from the rear of the tank.
Another method is to use athlete's foot spray, which dries as a white powder. Spray the bottom of the tank where the leak is suspected, and if fuel is leaking, it will wet the powder and clearly indicate the leak location.
Additionally, a true pressure test can be performed to identify any leaks, pin holes, or cracks in the welds or seams of the gas tank. This is important to do before painting the tank to ensure that the paint job is not ruined by any leaks.
If a leak is identified, it may be necessary to remove surface rust and treat corrosion before repairing the leak. This can be done by pouring acetone and adding ball bearings, nuts, and bolts inside the tank, ensuring the fill hole is sealed. Shake and rotate the tank to remove rust and create scratches for the epoxy to adhere to.
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