Ameer Randolph
Fuel tank putty is an epoxy putty used to repair fuel tank leaks. It is a hand-mixable, steel-reinforced, non-rusting compound that can withstand temperatures of 300° F and pressures of 900 Psi. To use it, one must first locate the leak, clean the area, mix the putty, and apply it to the leak. The putty hardens within 5 minutes and fully cures within an hour. This article will explore the process of repairing a fuel tank leak using fuel tank putty, including the preparation, application, and curing process.
| Characteristics | Values |
|---|---|
| Use case | Repairing fuel tank leaks |
| Effectiveness | Does not work on fuel tanks with fuel inside |
| Workability | Requires basic preparation work |
| Application | Apply to the repair surface within 30 minutes of mixing, forcing into any cracks or holes to be filled |
| Setting time | Sets in 5 minutes, can be machined in 1 hour, and fully cures in 24 hours |
| Temperature resistance | Withstands temperatures of 300° F |
| Pressure resistance | Withstands pressures of 900 Psi |
| Additional steps | Use a soldering iron to solder the crack, apply a plastic gas tank patch, and cover the area with epoxy glue |
| Safety | Eliminates dangerous welding |
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What You'll Learn
Locating the leak
Locating a fuel tank leak can be challenging. One of the most obvious signs of a leaking fuel tank is the smell of gasoline. Fuel can evaporate if it is leaking slowly, but if your car has been parked for a long period, you may notice a wet spot on the ground where the fuel has collected. Check the owner's manual to find the precise location of the tank, and inspect the area directly below it for signs of leakage. If your car is parked on concrete or blacktop, look for a darkened spot, and if it's parked on grass or foliage, you may notice discoloured or dead growth due to the gasoline.
Another way to identify a fuel leak is by regularly checking your fuel gauge levels. If you notice that your tank of gas isn't lasting as long as it used to, or if the fuel gauge drops significantly when the car hasn't been in use, your car might have a leak.
If you are trying to locate a leak in the tank itself, start by drying the tank with a towel, which should help you see where the leak is coming from. If the tank is very dirty or rusty, you may need to use a brake cleaner. Once you've located the leak, mark the spot and clean the surrounding area thoroughly. Use sandpaper to clean the area until you reach the bare metal surface, removing any rust, old paint, or dirt.
If you are having difficulty locating the leak, try removing the tank and pouring water through it. Watch for spots where the water seeps through, and note the size and location of these leaks. Remember that epoxy putty is suitable for repairing cracks and small holes, but for larger holes, welding may be a better option.
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Preparing the surface
Locate the Leak
Before beginning the repair work, it is essential to identify the exact location of the leak. This can be challenging, but using a towel to dry the tank can help make the leak visible. If the tank is heavily soiled or rusty, use a brake cleaner to improve visibility. Once the leak is located, mark the spot to indicate the area that requires attention.
Clean the Area
Thoroughly clean the area around the leak. Use sandpaper to remove any rust, old paint, road dirt, or muck from the fuel tank. Ensure that you sand an area of at least 3 to 4 inches around the leak, exposing the bare metal surface. This process not only removes contaminants but also creates a rough surface that enhances the adhesion of the putty. Remember to wear gloves during this process to protect your hands.
Prepare the Putty
After the surface is adequately prepared, it's time to prepare the putty. Put on your gloves and twist or cut off the required amount of putty from the epoxy stick. The putty typically comes in a two-part form, with contrasting colours. Knead the putty by hand until the colours are thoroughly mixed, and a uniform colour is achieved. If the putty is challenging to mix, warm it slightly above room temperature to soften it.
Apply the Putty
Once the putty is ready, work quickly as it will begin to harden within 30 minutes. Apply the putty to the repair surface, forcing it into any cracks or holes that need to be filled. Ensure that you press the putty firmly against the surface to create a tight seal. Use a tool moistened with clean water to remove any excess putty before it starts to harden.
Allow Curing
After application, the putty will take about 5 minutes to harden and approximately one hour to cure fully. During this time, do not disturb the repaired area. Once cured, the epoxy will be resistant to fuels and most solvents, providing a durable and effective repair to your fuel tank.
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Applying the putty
To apply the putty, first, locate the leak and mark it with a pencil. The leak may be difficult to find, so use a towel to dry the tank, which should make it easier to see. If the tank is very dirty or rusty, clean it with a little brake cleaner. Once you've found the leak, make sure the area around it is thoroughly cleaned—about 3 to 4 inches around the leak. Use sandpaper to clean the entire area, ensuring you get down to the bare metal surface. This process removes any rust, old paint, road dirt, or muck from the fuel tank.
Next, put on some gloves and twist or cut off the required amount of putty from the epoxy stick. Mix the putty by kneading it with your fingers until it is a uniform colour. If the putty is difficult to mix, warm it to room temperature or slightly above. Apply the putty to the repair surface within 30 minutes of mixing, forcing it into any cracks or holes that need to be filled. Flatten the putty against the tank to ensure complete coverage and avoid ending up with a large blob of putty. Remove any excess material with a tool moistened with clean water before the putty begins to harden.
When applying to a damp, wet, or slowly leaking area, work the mixed epoxy into the surface and apply pressure until adhesion begins to take effect. The putty will set in about 5 minutes and should be fully cured within an hour. It is recommended to wait for an hour or two before using the vehicle. Keep checking the repaired area for the next few days to ensure the repair is successful.
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Checking for a seal
- Flatten the Putty: Once you've applied the epoxy putty to the leak, use your fingers or a suitable tool to flatten the putty against the fuel tank's surface. Ensure that you spread it evenly and smoothly, covering the entire area of the leak.
- Initial Inspection: After flattening the putty, perform an initial inspection to check if the hole or crack has been thoroughly sealed. Look for any gaps or thin areas in the putty that might indicate an incomplete seal.
- Allow Curing Time: Epoxy putty typically requires time to cure and harden. Most products will specify a curing time, such as 60 minutes or an hour. During this time, the putty will transform from a malleable substance to a hard, durable seal.
- Re-inspect and Test: After the specified curing time has passed, re-inspect the repaired area. Carefully examine the putty to ensure that it has hardened and formed a solid barrier over the leak. Gently apply pressure to the putty to confirm its firmness and adhesion to the fuel tank.
- Monitor Over the Next Few Days: While the initial curing process typically takes about an hour, it's recommended to continue monitoring the repaired leak over the next few days. This includes checking for any signs of leakage or seepage around the repaired area.
- Consider a Test Drive: After the curing time has passed and you've confirmed that the putty appears solid and well-adhered, you may consider taking your vehicle for a short test drive. However, it's advisable to wait for at least an hour or two before driving, as suggested by some sources.
Remember, it's essential to follow the specific instructions provided by the manufacturer of your chosen epoxy putty product. These instructions may include additional steps or variations in the process, ensuring that you achieve a proper seal and effective repair.
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Curing time
The curing time for fuel tank putty varies depending on the product and the conditions. Some products, such as TankWeld™, claim to fully cure within an hour of application. Others, like Permatex® Fuel Tank Epoxy Putty, suggest that the putty sets in an hour but takes 24 hours to fully cure.
It is important to note that the curing time can be influenced by factors such as temperature and humidity. In warmer temperatures, the curing process may be accelerated, while in cooler temperatures, it may take longer. Additionally, some products may require multiple applications or thicker layers, which can also extend the curing time.
For example, the JB Weld Gas Tank Repair Kit, which includes epoxy putty and fiberglass cloth, is recommended for larger repairs or tanks with multiple pinhole leaks. This product may require more time to cure compared to a smaller, single repair.
When using a two-part liquid epoxy system, it is important to ensure that the fuel tank is empty and free of fuel. If the tank still contains fuel, the epoxy may not cure properly, and the fuel can leak through. Therefore, it is crucial to follow the manufacturer's instructions and allow adequate curing time, which may vary depending on the product and the extent of the repair.
In some cases, it is recommended to wait at least 48 hours or even a week before refilling the fuel tank to ensure that the repair is secure and fully cured. This extended curing time allows for a more durable and reliable repair, reducing the risk of future leaks.
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Frequently asked questions
Fuel tank putty is an epoxy putty compound that can be used to repair fuel tank leaks. It is a hand-mixable, steel-reinforced, non-rusting epoxy putty that forms an industrial-strength polymer compound after mixing.
Fuel tank putty works by sealing the leak in a fuel tank. The putty is mixed and then applied to the leak, where it hardens and cures, preventing any further leakage. It is important to clean the area around the leak before applying the putty to ensure proper adhesion.
Fuel tank putty typically sets within 5 minutes of application and is fully cured within an hour. However, it is recommended to wait for an hour or two before using the vehicle to allow for proper drying and hardening of the putty.
