Ameer Randolph
Plastic fuel tanks are popular in motorcycle racing and among ATV enthusiasts due to their light weight and flexibility. However, they are susceptible to cracks and holes, which can lead to fuel leaks. While some sources suggest using epoxy glue or a plastic welder for repairs, others warn that epoxy glue may not be a long-lasting solution as the tank contracts and expands with temperature changes. A more durable method involves using a soldering iron and HDPE plastic to fill in the crack with the same type of plastic as the original tank, ensuring that the repair expands and contracts with the rest of the tank.
Characteristics and Values Table for Patching a Plastic Diesel Fuel Tank
| Characteristics | Values |
|---|---|
| Plastic type | HDPE plastic |
| Plastic properties | Excellent chemical resistance, not affected by strong acids or bases, resistant to gentle oxidants and reducing agents |
| Plastic challenges | Difficult to fix with glue due to chemical resistance |
| Repair methods | Epoxy glue, heat soldering with HDPE plastic, plastic welding, fiberglass cloth and plastic bonder epoxy, plastic welding stick, fuel-rated glue, sheet steel roofing screw |
| Repair considerations | Clean repair area, ensure tank is empty and well-ventilated, sand surrounding area, use appropriate temperature and tools |
| Commercial products | Marine Tex, Seal-All, Permatex, JB Weld, Right Stuff, Jb Tank Weld, Plastic Metal, Fuel Tank Repair Patch Kits |
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What You'll Learn
Using epoxy glue
While some sources suggest that epoxy glue can be used to patch a plastic diesel fuel tank, others claim that epoxy will not stick to the plastic used for these fuel tanks. One source suggests using a soldering iron to melt the plastic back together instead of using glue.
If you do want to try using epoxy glue, here is one suggested method:
- Clean the area with Isopropyl or Acetone.
- Sand the area around the hole to create more surface area for the epoxy to bond to.
- Apply the epoxy to the sanded area and the screw threads and under the head of a large stainless steel screw.
- Screw the screw into the hole and apply more epoxy over the screw and the surrounding area.
Another method is to use a polypropylene 'welding stick' to plug the hole, then melt the stick to the tank. You can then optionally roughen the area and spread a fuel and plastic-rated glue over the area.
It is important to note that some fuel tank repair epoxy kits specifically state that they are not meant for plastic fuel tanks, so be sure to check the manufacturer's instructions before using any product.
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Plastic welding
To start the repair, empty the fuel tank and leave it open to prevent pressure build-up. Next, use medium-grit sandpaper to sand the area around the crack or hole. Sanding cleans the surface and creates a rough texture that will help the plastic stick bond better to the tank. After sanding, use a soldering iron or a plastic welder to heat the crack or hole. If using a soldering iron, set the temperature between 250-300 degrees Celsius and choose a wider tip to distribute heat evenly.
Once the area is heated, melt a plastic welding rod or a piece of HDPE plastic into the crack or hole. This will create an initial seal and ensure that both sides of the crack are bonded together. You can also use a combination of a heat gun and a soldering gun with high-density polyethylene strips to fill the crack. If using a plastic welder, feed the plastic rod through the hole in the welder, which will melt it as it comes out the other side.
After filling the crack or hole with melted plastic, allow it to cool and solidify. Once cooled, test the repair by filling the tank and checking for any leaks. This method of plastic welding provides a strong and durable repair, as the patch is melted directly into the original tank, creating a seamless bond.
While plastic welding is an effective solution, there are also alternative methods for patching a plastic diesel fuel tank. Some people have used epoxy glue or fiberglass cloth with plastic bonder epoxy to create a temporary fix. However, these methods may not be as durable as plastic welding, especially with the expansion and contraction of the fuel tank. It is important to note that the success of the repair depends on using the correct materials and techniques for the specific type of plastic in the fuel tank.
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Sanding the area
To begin, use medium-rough or coarse-grit sandpaper to sand the area. You can find this type of sandpaper at most hardware stores. Sanding will help to roughen the surface, which will improve adhesion when you apply the patch. It is also important to ensure that the area is clean and free of any debris or residue.
After sanding, use a clean cloth saturated with rubbing alcohol to wipe down the area. This will remove any remaining dust or contaminants, ensuring a strong bond between the patch and the tank. It is crucial to follow this step, as any remaining dirt or grease could compromise the repair.
Once the area is sanded and cleaned, it is ready for the next step in the repair process, which may involve applying heat, using a soldering iron, or applying an adhesive to attach the patch.
It is worth noting that some repair methods may not require extensive sanding. For example, if you are using a plastic welding technique, you may only need to rough up the area lightly before proceeding. However, for most repair methods, sanding is an essential step to ensure a durable and long-lasting patch.
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Using a fiberglass cloth patch
To patch a plastic diesel fuel tank using a fiberglass cloth patch, you will first need to drain the tank and let it dry completely. Once dry, sand the area around the hole or crack with coarse grit sandpaper. This will roughen the surface and allow for better adhesion. It is important to note that you should not use a plastic welding technique before applying the fiberglass patch, as the tank will flex in a way that the fibreglass won't, and it will eventually delaminate.
Next, clean the area with a cloth soaked in a solvent such as isopropyl, acetone, or rubbing alcohol. This will ensure that any oil or grease is removed and the adhesive will be able to bond properly. You can then apply a fuel and plastic-rated glue or epoxy to the area. Cut a piece of fiberglass cloth slightly larger than the hole or crack, and place it over the glued area, pressing it down firmly.
You can also use a heat gun to apply resin to the fiberglass cloth, being careful not to burn yourself. Work the resin into the cloth, ensuring that it is fully saturated. This method may be more suitable for complex shapes as it allows you to mould the cloth to the shape of the tank.
Once the epoxy or resin has dried, you can smooth out any bumps or unevenness with sandpaper. If desired, you can then spray paint the area with plastic paint to protect the patch and improve its appearance.
It is important to note that while a fiberglass patch can be a quick and easy fix for a plastic diesel fuel tank, it may not be a permanent solution. The diesel fuel may eventually seep through the patch, so it is recommended to monitor the patch regularly and replace it if necessary.
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Emptying the tank
Firstly, drain the diesel fuel from the tank. Place a bucket or container underneath the tank to collect the leaking fuel, as demonstrated in one user's experience. This step ensures that the tank is emptied and reduces the risk of fuel spillage during the repair process.
Once the tank is drained, it is important to allow it to dry thoroughly. This step may take some time, and it is crucial for ensuring that no residual fuel remains in the tank, which could affect the repair process.
While waiting for the tank to dry, it is recommended to prepare the work area by donning protective gear. As welding or soldering will be involved in the repair process, ensure that you are wearing protective eye gear, a welding helmet, and welding gloves. This gear will shield you from any potential hazards during the repair.
After the tank is completely dry, the next step is to sand the area around the hole or crack. This process serves two purposes. Firstly, it cleans the area, removing any debris or residue that could interfere with the repair. Secondly, it creates a rough surface, which will help the adhesive or welding rod bond more effectively to the tank. Use medium-rough or coarse-grit sandpaper for this step, and ensure that you sand until the area feels sufficiently roughened.
Finally, clean the sanded area with a cloth. It is recommended to use a shop cloth or paper towel soaked in rubbing alcohol or soap and water for this step. This cleaning process will eliminate any remaining dust or particles, ensuring that the repair area is spotless and ready for the next steps, such as applying an adhesive or welding.
By following these detailed steps for emptying and preparing the plastic diesel fuel tank, you will create a safe and effective foundation for the subsequent repair stages.
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Frequently asked questions
The best way to patch a plastic diesel fuel tank is to use a plastic welding kit. First, drain the tank and let it dry. Then, sand the area around the hole or crack and clean it with a cloth soaked in rubbing alcohol. Next, use a plastic welding rod to fill in the crack or hole. Start at the edge and run the bead completely around the opening, then begin crossing over the hole.
Most fuel tanks are made from HDPE plastic (High-density polyethylene). This type of plastic is resistant to strong acids, strong bases, and gentle oxidants and reducing agents.
Some temporary solutions to patching a plastic diesel fuel tank include using an outboard fuel tank or using epoxy glue and a fiberglass patch.
