How to Seal a Plastic Gas Tank

How to Seal a Plastic Gas Tank

If you have a plastic gas tank, keeping it properly sealed will not only extend its life but ensure performance and safety as well. Plastic tanks, such as those found on lawnmowers and outboard motors, provide excellent durability against wear and tear. The following steps will detail how to properly seal a plastic gas tank.

Step One: Prepare the Plastic Gas Tank

Before you can seal a plastic gas tank, you must prepare it first. This means removing any dirt, debris, or corrosion from the surface of the tank. To do this, you will need a degreaser, an abrasive pad, and a paint-grade primer. Start by using the degreaser to clean the tank. Follow up with the pad to remove any remaining residue or corrosion. Finish by cleaning the tank with a paint-grade primer.

Step Two: Install the Sealant

When the tank is properly prepared, you can then begin the process of sealing the tank. You will need a sealant specifically designed for use with plastic gas tanks. Prior to applying the sealant, make sure there are no cracks, holes or other imperfections in the tank. Once you are sure the tank is in good condition, you can then start to apply the sealant. Gently unroll the sealant and apply a thin layer along the inside circumference of the tank. Be sure to press the sealant into the edges and dips of the tank for a secure fit.

Step Three: Test the Sealant

Once the sealant has been applied, the next step is to test the seal to make sure it is airtight. To do this, you will need to fill the tank with a water and soap mixture. Fill the tank completely and then check for any signs of air bubbles or other leaks. If there are any, apply additional sealant to the area until the leak is properly sealed. Once the seal is confirmed to be airtight, you can then turn off the valve and drain the tank.

Step Four: Dry and Cure the Sealant

Once the sealant is properly applied, it is important to allow it to dry and cure before using the tank. This process can take up to 24 hours, depending on the type of sealant used. After that time, the sealant should be fully dry and ready for use. Make sure to follow the instructions on the sealant package for a proper curing time.

Step Five: Re-Test the Sealing

Before using the tank, it is recommended that you re-test the seal one final time. This helps ensure that the seal will not fail when the tank is under pressure. To do this, you can fill the tank with water and soap mixture one more time and check for any leaks or air bubbles. If there are any, apply additional sealant until the leak is sealed.

Conclusion

Sealing your plastic gas tank properly is key to ensuring its performance and safety. A properly sealed tank will help prevent leaks and minimise the risk of fire. By following the steps above, you should have a properly sealed gas tank that will last for years with proper upkeep.