Rajan Wilcox
Cleaning a motorcycle fuel tank is an important maintenance task to ensure that no harmful materials get into the engine and cause damage. It also helps to prevent clogging in the fuel lines. This process becomes especially necessary when a bike has been sitting unused for a long time. This guide will take you through the steps of flushing a motorcycle fuel tank, from initial checks for rust and debris to the various methods for cleaning and sealing the tank.
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What You'll Learn
Removing and replacing the tank
The first step is to remove the fuel from the tank. This can be done by running it down, siphoning it out, or draining it into a receptacle by removing the fuel line. It is important to be cautious during this step as fuel may spill or leak. Once the fuel is removed, the next step is to disconnect the tank straps, if applicable, and then remove the tank bolts. At this point, you may need to access connections beneath the fuel tank, but the tank itself should remain in place.
The next step is to disconnect the fuel pump and clear gas lines. It is important to relieve the pressure in the fuel lines before disconnecting any hoses. This can be done by unplugging the connector for the fuel pump, which may be located under the seat, tank, or on the sides, and then turning on the motorcycle and holding the start button for a few seconds. After the fuel pump is disconnected, you can then remove the fuel tank.
To replace the tank, simply follow these steps in reverse. Start by securing the fuel pump and gas lines, then attach the tank bolts and tank straps. Finally, refill the fuel tank and test the motorcycle to ensure it is functioning properly.
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Sealing the tank holes
Before you begin, it's crucial to remove the fuel tank from the motorcycle and empty it of any remaining fuel. This will ensure that you have a safe and accessible workspace. Once the tank is empty, identify all the openings in the tank, including the filler cap, petcock outlet, and any crossover tubes or fuel valves.
To seal the tank holes, you'll need the appropriate equipment. For small holes, silicone plugs, rubber or vinyl vacuum caps, and bungs are effective solutions. If you're working on a modern motorcycle, you may need to address the fuel pump plate, which can be sealed using a gasket and a block-off plate. Additionally, if there are any tap holes, avoid using corks, putty, or similar substances as they can come loose and expose you to chemicals. Instead, use bolts to securely block off these holes.
If your fuel tank has larger openings, such as the filler neck, you may need to use a combination of hoses and heavy clamps to block them off temporarily while you work on the tank. This will prevent the escape of gasoline and ball bearings during the cleaning process.
After sealing the tank holes, you can proceed with flushing the fuel tank. It is recommended to use gasoline instead of diesel when flushing to avoid clogging the fuel lines. Always exercise caution when working with flammable substances, and ensure there are no open flames or cigarettes nearby.
Once you've completed the flushing process and allowed the tank to dry, you can remove the plugs, caps, and filler cap. At this stage, it's crucial to ensure that the tank is thoroughly dried to prevent any residual moisture from causing future issues.
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Cleaning the tank
Cleaning a motorcycle fuel tank is a necessary maintenance task to ensure no harmful materials get into the engine and damage it. It also prevents clogging in the fuel lines. The first step is to drain the tank to avoid spilling gasoline and unhook the gas lines or vacuum lines. If your motorcycle has fuel valves linked to the gas tank, remove them before beginning the cleaning process.
The next step is to check for rust inside the tank. If there is no rust, add a fuel system cleaner, like Seafoam, and slosh it around before letting it soak. Drain it through the petcock and repeat for a few tanks. If there is rust, you can try using a handful of ball bearings and half a gallon of diesel. Shake the tank to ensure you get all the ball bearings out, as they can block the fuel line. You can also use a tumbler to remove rust.
For more severe cases of rust, you may need to use chemicals like hydrochloric acid or a product like POR-15. Be very cautious when using these products, as they can be dangerous if not handled properly. Always wear appropriate clothing and safety gear when working with chemicals.
After cleaning, rinse the tank thoroughly and dry it completely before reinstalling it on your motorcycle.
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Drying the tank
First, ensure that the tank is completely empty and free of any residual fuel, debris, or cleaning solutions. It is crucial to be cautious and avoid any open flames or sparks during this process, as gasoline is highly flammable.
Next, seal all openings of the tank securely. This includes the filler cap, petcock outlet, and any other holes or outlets specific to your motorcycle model. You can use various materials for sealing, such as silicone plugs, rubber or vinyl vacuum caps, or even short lengths of hose secured with heavy clamps. Make sure that all openings are tightly blocked to prevent any spillage during the drying process.
Now, you can utilize a heat gun to dry the inside of the tank. Exercise caution when using a heat gun to avoid burning yourself or damaging the paint. Alternatively, some motorcycle enthusiasts suggest leaving the tank to dry in direct sunlight, which can be an effective natural drying method.
If you choose to use a heat gun, be sure to direct the hot air into the tank to accelerate the evaporation of any remaining moisture. It is important to be cautious and avoid overheating the tank, as this could potentially damage the tank or any surrounding components.
Once you are satisfied that the tank is completely dry, it is a good idea to pour a small amount of fresh, clean gasoline into the tank and seal it again. Roll or rotate the tank gently to ensure that the gasoline coats all the internal surfaces. This final step helps prepare the tank for reinstallation and prevents any moisture accumulation that could lead to rust formation.
By following these steps, you can effectively dry your motorcycle fuel tank, ensuring that it is ready for refilling and reinstallation on your bike. Remember to always prioritize safety and be cautious when working with flammable liquids and heating equipment.
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Preventing future damage
To prevent future damage to your motorcycle fuel tank, it is important to take the necessary steps to maintain and care for it properly. Here are some detailed instructions to help you achieve that:
Firstly, it is crucial to keep the fuel tank clean and free from rust and debris. Regularly inspect the inside of the tank for any signs of rust or debris buildup. You can use a flashlight, mirror, or bore scope to thoroughly examine the interior surfaces. If you notice any rust, be sure to clean it promptly using a safe and effective method, such as vinegar or a commercial rust remover.
To clean the tank with vinegar, start by removing the gas tank cap and emptying any remaining fuel. Then, fill the tank with a solution of vinegar and water, following the recommended dilution ratio. Allow the solution to sit for several hours or even days, depending on the severity of the rust. Finally, rinse the tank thoroughly with clean water and dry it completely before refilling it with fuel.
Alternatively, you can use a commercial rust remover, such as WD-40, following the instructions on the product. Always work in a well-ventilated area when using chemicals, and wear appropriate safety gear, including gloves, eye protection, and a mask.
In addition to rust removal, it is important to prevent rust from occurring in the first place. One way to do this is by ensuring that the fuel tank is always sufficiently filled with fuel. Leaving the tank empty for extended periods can promote rust formation. Additionally, always use refined fuel and keep the gas tank closed when not in use.
Another way to prevent rust is by applying a protective coating to the inside of the tank. This can be done using a product like POR-15, which creates a solid coating that protects against rust. You can also use a small amount of diesel or a thin layer of oil to coat the interior surfaces, creating a barrier that prevents rust formation.
Finally, regular maintenance of your motorcycle's fuel system is crucial. Use a fuel system cleaner, such as Sea Foam, by adding it to your fuel tank and running the engine for several minutes. This will help clean the fuel passageways and carburetor circuits, ensuring optimal performance and reducing the risk of future issues.
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Frequently asked questions
If your bike has been sitting for a long time without being started, there could be a build-up of debris in the motorcycle fuel tank. Check for rust with a light and a small mirror. If you notice discolouration, this could indicate a problem.
First, drain the tank of any remaining fuel and unhook the gas and vacuum lines from the tank. You may need to remove fuel valves and the low fuel sensor. Block off all openings with short hoses and heavy clamps to prevent spillage.
You can flush the tank manually with the tank taken off the bike. Use diesel and ball bearings to clean the tank, shaking vigorously to remove rust particles. Alternatively, you can use a fuel system cleaner like Seafoam, or a household product like vinegar or Coca-Cola.
After flushing the tank, rinse it thoroughly with water and leave it to dry. You can use a heat gun to speed up the drying process, but be cautious to avoid burning yourself or the paint. Once the tank is dry, pour in a splash of 2-stroke gas and roll the tank around to coat the inside surfaces.
