Rajan Wilcox
Plastic fuel tanks are highly sought after in motocross, ATV, and motorcycle racing due to their lightweight and seamless design, which prevents leaks and corrosion. However, they can become scratched, discoloured, or develop holes and cracks over time. To rejuvenate a plastic fuel tank, one must first drain the tank of gasoline and allow it to dry. Next, the affected area must be cleaned and sanded to ensure a smooth surface for repairs. If the tank has scratches or discolouration, one can use a razor blade or box knife blade to carefully remove the damaged layer of plastic before sanding. Deeper scratches and holes can be repaired using a plastic welding rod, epoxy glue, or a fiberglass patch. It is important to note that the type of plastic and the severity of the damage will determine the best method for rejuvenation.
How to Rejuvenate a Plastic Fuel Tank
| Characteristics | Values |
|---|---|
| Tools | Razor blade, box knife blade, orbital sander, plastic welding rod, plastic welding machine, epoxy glue, fiberglass patch, soldering iron, sanding paper |
| Preparation | Drain the tank, remove remaining fuel, clean the tank, dry the tank, sand the tank, wear protective gear |
| Sealing | Apply epoxy glue, use a plastic welding rod, fill in the crack or hole, sand and paint |
| Patching | Cut a plastic or fiberglass patch, cover the hole, press into the epoxy |
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Sanding the tank
Before beginning the sanding process, it is crucial to drain the fuel tank completely and allow it to dry both inside and out. This ensures that the sanding is effective and safe. Wear appropriate protective gear, including gloves and eye protection, to safeguard against any potential hazards.
The type of sanding paper or tool used can vary depending on the condition of the tank and the extent of the damage. For initial sanding, a coarse grit paper, such as 150 or 220-grit, can be used to remove any discolouration or deep scratches. This step may require significant elbow grease, especially if there are multiple layers of discolouration or oxidation to remove. A razor blade can also be used to scrape away any stubborn deposits before progressing to sanding. It is important to work carefully with the razor blade to avoid adding new gouges to the surface.
Once the majority of the discolouration is removed, you can switch to a finer grit sanding paper, such as 320-grit. This helps to smooth out the surface and create a more even finish. It is recommended to use wet/dry sanding paper during this step, as it can be used with water to create a smoother sanding process and reduce the risk of overheating the plastic. The sanding process should be gradual, starting with a coarse grit and gradually progressing to finer grits to achieve the desired smoothness.
After sanding, it is essential to clean the area with a cloth saturated with rubbing alcohol or a similar solvent. This ensures that any remaining debris or residue is removed, creating a clean surface for the repair process. The sanding step prepares the surface for the application of epoxy glue, plastic welding, or other repair methods, ensuring a strong and durable bond.
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Using a razor blade
When using a razor blade, it is important to apply a good amount of elbow grease, as it requires some effort to effectively rejuvenate the tank. It is also worth noting that a standard razor blade may not be as effective as a box knife blade, which can cut faster and deeper, allowing you to shave off enough plastic to see a difference in color.
After using a razor blade, you can begin the process of sanding. It is recommended to start with a coarse grit, such as 220, and then step up to a finer grit, such as 2000. This will help to smooth out the surface of the plastic and remove any marks left by the razor blade.
For tanks with existing deep scratches, it may be necessary to decide whether to try and remove the scratch or leave it. As mentioned earlier, removing too much material can make the plastic translucent. In such cases, it may be better to focus on improving the surrounding area rather than attempting to remove the scratch entirely.
Overall, using a razor blade is an effective method for rejuvenating a plastic fuel tank, but it requires careful technique and a good amount of effort to achieve the desired results.
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Epoxy glue
Once the area is prepared, it's time to mix the epoxy glue. Epoxy glue is typically a two-part mixture that needs to be thoroughly combined to form a uniform colour. After mixing, apply the epoxy glue over the opening and, if desired, press a fiberglass patch over the epoxy to add strength. Allow the epoxy to dry completely, then smooth out any bumps or unevenness with sandpaper.
For larger holes or structural repairs, it is recommended to use a dedicated gas tank epoxy or epoxy putty, such as JB Weld or Blue Magic Quiksteel, which can provide a stronger and more permanent bond. These products are designed to repair heavy-duty leaks and can be used on various materials, including metal and plastic.
It is important to note that some epoxy glues may not adhere well to certain plastics, such as HDPE or XLHDPE, due to their low surface energy. In these cases, flame treating the surface with a torch before applying the epoxy can help increase its surface energy and improve adhesion. Additionally, always follow the manufacturer's instructions and safety precautions when working with epoxy glue and fuel tanks.
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Plastic welding
To begin the plastic welding process, it is important to identify the type of plastic used in the fuel tank. In the case of the Dodge RamCharger, it is made of polyethylene, which is suitable for plastic welding. Once the plastic type is identified, the appropriate welding equipment and materials should be sourced. For polyethylene tanks, a plastic welder, such as the Polyvance ATV PRO welder kit, can be used along with polyethylene rods as filler material.
Before starting the welding process, it is crucial to prepare the fuel tank by emptying it of any fuel and ensuring it is clean and free from contaminants. This can be done by draining the tank, flushing it with water, and allowing it to dry thoroughly to remove any residual fuel fumes. Additionally, if there are any cracks or damage to the tank, it is recommended to drill small holes at each end of the crack to prevent it from spreading further.
The next step is to use the plastic welder to heat up the damaged area and melt the plastic. This helps create an initial seal and ensures that both sides of the crack are properly welded together. The polyethylene rod can then be fed through the hole in the welder, melting as it comes out and filling the crack. It is important to maintain a consistent temperature between 250-300 Celsius for even heat distribution and effective bonding.
After the welding process is complete, it is essential to allow the repaired area to cool and solidify. Once cooled, the tank can be reinstalled and tested for leaks by filling it with water. If any leaks are detected, they can be addressed using a propane torch and a butter knife. Overall, plastic welding is a cost-effective and reliable method for rejuvenating plastic fuel tanks, and with practice, one can improve their skills and attention to detail.
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Filling with plastic
Once the tank is dry, the next step is to identify the area that needs to be repaired. This area should be cleaned and prepared for the repair. It is recommended to use medium-rough sandpaper to sand around the crack or hole. Sanding serves two purposes: it cleans the area, creating a better surface for the plastic to bond with, and it helps to fill the crack or hole with sanding debris, providing a stronger repair.
After sanding, the next step is to create a plastic stick or patch to fill the damaged area. To do this, you can use a piece of HDPE plastic, which is the same type of plastic used in fuel tanks. Cut a piece of HDPE plastic that is approximately 1 cm wide and 10-15 cm long. Wash and clean this plastic stick with water and dry it thoroughly with a paper towel.
Now, you will need a soldering iron to heat the repair area and the plastic stick. Set the soldering iron to a temperature between 250-300 degrees Celsius, and use a wider tip, about 1 cm wide, to evenly distribute the heat around the crack or hole. Take the plastic stick in one hand and the soldering iron in the other, and carefully apply the heated plastic to the damaged area. The heat will help the new plastic to bond with the existing plastic, filling the crack or hole.
It is important to work carefully and wear appropriate protective gear, including eye protection and gloves, when using a soldering iron. Additionally, ensure that the area is well-ventilated to dissipate any fumes. Once the repair is complete, allow the area to cool and dry completely before refilling the fuel tank and testing it.
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Frequently asked questions
The first step is to drain the tank of any fuel and allow it to dry.
One way to fix a crack is to use a soldering iron and a small piece of HDPE plastic to fill the crack.
You can use a razor blade or a box knife blade to carefully shave off the plastic and remove the scratches. Then, use wet sandpaper to smooth the area.
You can use a two-part epoxy glue to seal a plastic fuel tank. However, this may fail after a short time as the tank contracts and expands.
