5 Best Fuel Tank Sealers to Extend the Life of Your Vehicle

Your vehicle's fuel tank is like a fortress, safeguarding the lifeblood of your car. But what happens when rust and corrosion start to breach its defenses? That's where the importance of a reliable fuel tank sealer comes into play.

Imagine a solution that can help seal those vulnerabilities, prolonging the lifespan of your vehicle's vital components. Stay tuned to discover the top 5 fuel tank sealers that could be your car's armor against the elements, ensuring a smoother ride for miles to come.

POR-15 Fuel Tank Sealer (8 Fluid Ounces)

If you're looking for a reliable and durable solution to seal your metal fuel tank, the POR-15 Fuel Tank Sealer (8 Fluid Ounces) is your best bet. This product, manufactured by POR-15, is a compact liquid sealant that comes in a small 8-fluid-ounce container. Its silver color blends well with metal surfaces, making it ideal for metal fuel tanks.

The non-porous sealant is designed to stop rust, corrosion, and leaks, providing resistance to all fuels, alcohols, and additives. Users have reported positive experiences with this product, praising its effectiveness in sealing fuel tanks and preventing leaks. The application instructions are straightforward, detailing the cleaning process, application method, and tips for achieving the best results.

Rest assured, this sealant is a top choice for your metal fuel tank needs.

Best For: DIY enthusiasts, motorcycle owners, and antique collectors looking to effectively seal metal fuel tanks against rust and leaks.


  • Stops rust, corrosion, and leaks effectively
  • Resistant to all fuels, alcohols, and additives
  • Non-porous sealant for durable protection


  • May require careful application to avoid spills or mess

KBS Coatings 5200 Gold Standard Tank Sealer – 8 fl. oz., Silver

For vehicle owners seeking a durable and waterproof tank sealer that excels in corrosion protection, the KBS Coatings 5200 Gold Standard Tank Sealer in silver offers a reliable solution. This compact sealer, weighing 8 ounces with dimensions of 2.9 x 3 x 2.8 inches, is compatible with asphalt, vinyl, and metal surfaces. Its liquid form and waterproof properties make it an excellent choice for sealing fuel tanks effectively. Manufactured in the USA, this tank sealer has a flash point of 40.0, ensuring safe usage. With positive customer reviews averaging 4.5 out of 5 stars, this product ranks #15,425 in Automotive and #51 in Care Corrosion & Rust Inhibitors. Consider the KBS Coatings 5200 Gold Standard Tank Sealer for a reliable and efficient solution to protect your vehicle's fuel tank.

Best For: Vehicle owners looking for a durable and waterproof tank sealer with excellent corrosion protection capabilities.


  • Compact size for easy storage and handling.
  • Compatible with various surfaces such as asphalt, vinyl, and metal.
  • High customer satisfaction with positive reviews averaging 4.5 out of 5 stars.


  • Limited to 8 fl. oz. size, may require multiple purchases for larger tanks.

Kreem Products 19-103 Black Fuel Tank Liner Combo Pack, 3 Pack

Ideal for vehicle owners seeking a reliable solution to seal and protect their fuel tanks, the Kreem Products 19-103 Black Fuel Tank Liner Combo Pack offers a 3-step system that effectively prevents rust, corrosion, and leaks. This product is designed to fit various vehicle types, making it suitable for custom tanks. Customers praise its long-lasting effectiveness and its ability to work on different tank materials. To ensure optimal results, it's essential to prepare the tank surface properly and follow the application instructions diligently. While the process may be time-consuming, the Kreem Products 19-103 Black Fuel Tank Liner Combo Pack is highly recommended for its effectiveness in addressing rust issues and enhancing fuel system performance.

Best For: Vehicle owners looking to effectively seal and protect their fuel tanks against rust and corrosion.


  • Long-lasting effectiveness
  • Works on various tank materials
  • Helps remove rust and old lining material


  • Requires proper ventilation

J-B Weld 2110 Metal Fuel Tank Repair Kit, Gray

When repairing cracks and holes in your vehicle's fuel tank, the J-B Weld 2110 Metal Fuel Tank Repair Kit stands out as a versatile and dependable solution. This kit contains everything you need for professional quality permanent repairs without requiring the removal of the gas tank. It can effectively repair cracks up to 4' in length and holes up to 3/8' in diameter. Its versatility extends beyond gas tanks to metal tanks, oil pan repairs, and more. The J-B Weld 2110 is designed for ease of use and provides a reliable fix. With positive user reviews praising its effectiveness and providing helpful tips for application, this gray-colored repair kit offers a convenient and durable solution for your fuel tank repair needs.

Best For: DIY enthusiasts and car owners looking for a versatile and reliable solution for repairing cracks and holes in metal fuel tanks and other automotive components.


  • Easy to use with no removal of gas tank required
  • Versatile application for various repairs on metal tanks and oil pans
  • Professional quality permanent repairs for cracks and holes


  • Product may harden quickly, requiring swift application

Northern Fuel Gas Tank Liner And Sealer

Sealing leaks and preventing rust, the Northern Fuel Gas Tank Liner And Sealer offers vehicle owners a durable solution for maintaining their fuel tanks. Designed to seal existing rust and prevent it from flaking off and clogging the fuel line, this product is excellent at sealing pinhole leaks along seams and straps. It forms a tough, flexible membrane that doesn't crack or flake, providing long-lasting protection. By blocking condensation contact with metal, it also helps prevent future rust from forming.

Manufactured by Twisted Choppers, this gas tank liner and sealer has received positive feedback, with a rating of 4.5 out of 5 stars from 14 reviews. It's an effective option to consider for extending the life of your vehicle's fuel tank.

Best For: Vehicle owners looking for a durable solution to seal leaks and prevent rust in their fuel tanks.


  • Effectively seals existing rust to prevent flaking off and clogging fuel line.
  • Excellent at sealing pinhole leaks along seams and straps.
  • Forms a tough, flexible membrane that doesn't crack or flake.


  • May require thorough surface preparation for optimal results.

Factors to Consider When Choosing Fuel Tank Sealer

When selecting a fuel tank sealer, you should focus on:

  • Material compatibility
  • Application techniques
  • Rust prevention
  • Sealant durability
  • Tank compatibility

These factors will ensure that you choose a sealer that effectively addresses your specific needs and prolongs the life of your fuel tank.

Material Compatibility

To choose the right fuel tank sealer, prioritize material compatibility by ensuring it adheres effectively to the metal used in your tank. Check if the sealer is suitable for the fuels, alcohols, and additives in your vehicle to prevent chemical reactions.

Opt for a non-porous sealant to block leaks and deter rust formation, enhancing tank longevity. Look for sealers specifically crafted for metal tanks to ensure optimal adhesion, durability, and corrosion resistance.

Verify compatibility with the recommended tank surface for a secure, long-lasting seal that prevents leaks and maintains the tank's condition. Material compatibility is crucial in selecting a fuel tank sealer that will effectively extend the life of your vehicle.

Application Techniques

For successful application of fuel tank sealer, prioritize proper surface preparation as a crucial step. Begin by thoroughly cleaning and degreasing the interior of the tank to ensure optimal adhesion.

When applying the sealer, remember to do so in thin, even coats to achieve a uniform and effective seal. Ensure all interior surfaces are completely covered to provide long-lasting protection against corrosion.

Follow the manufacturer's instructions regarding drying times and curing processes meticulously for maximum effectiveness. Some sealers may require multiple coats or specific application techniques for optimal results, so be sure to adhere to these guidelines.

Rust Prevention

Considering the importance of rust prevention in fuel tanks, selecting a sealer with robust anti-corrosion properties is paramount for long-lasting protection.

Fuel tank sealers act as a protective barrier that stops existing rust from spreading and prevents new rust formation by shielding the metal tank from corrosive elements.

Sealants like POR-15 and KBS Coatings are renowned for their rust-resistant properties when applied to metal fuel tanks. To ensure continued rust prevention, it's crucial to choose a high-quality sealer with these anti-corrosion features.

Additionally, regular maintenance and inspection of the fuel tank post-application can help maintain the sealer's effectiveness in protecting against rust, prolonging the life of your vehicle's fuel system.

Sealant Durability

When selecting a fuel tank sealer for your vehicle, prioritize durability to ensure long-lasting protection against rust and leaks. Look for sealants that create a non-porous membrane to prevent fuel and additives from causing damage.

Consider the sealant's resistance to various fuels, alcohols, and additives commonly used in vehicles. The sealant should be able to withstand condensation and temperature changes to provide effective protection.

Opt for sealants that offer a tough and flexible coating to adapt to the movement and stress experienced by the fuel tank. Choosing a durable sealant will help maintain the integrity of your fuel tank and prolong its lifespan, keeping your vehicle running smoothly.

Tank Compatibility

Ensure your chosen fuel tank sealer is compatible with the material, size, and shape of your fuel tank to guarantee effective sealing results. Consider the material of your tank, such as metal, asphalt, or vinyl, to ensure the sealer will adhere properly. Check the manufacturer's recommendations to see which tank types the sealer is designed for. Some sealers work better on specific materials, so choose accordingly.

Also, verify compatibility with fuels, additives, and alcohols to ensure long-term effectiveness. Size and shape are crucial too; make sure the sealer is suitable for your tank's dimensions to achieve the best sealing outcome. By considering these factors, you can select a sealer that will work optimally with your specific fuel tank.

Ease of Use

For a smoother application process when choosing a fuel tank sealer, prioritize examining the application method and complexity. Look for sealers that come with clear and detailed application instructions to ensure a smooth process.

Additionally, consider sealers that offer user-friendly packaging and accessories to aid in the application. Evaluate the drying and curing time of the sealer as this can impact the overall convenience of the product.

It's also beneficial to seek feedback from other users to understand their experiences with the ease of application and any potential challenges they may have faced.

Prioritizing these factors will help you choose a fuel tank sealer that's easy to use and effective.

Long-Term Effectiveness

To select a fuel tank sealer with lasting protection against rust and corrosion, consider the product's resistance to various fuels, additives, and environmental conditions. Opt for sealants that can withstand a wide range of fuels to prevent deterioration over time.

Additionally, choose a sealer that's resistant to common additives found in fuel, ensuring long-term effectiveness. Environmental conditions can also impact the durability of the sealer, so look for products that can endure fluctuations in temperature and humidity.

A durable and non-porous sealant will provide extended protection for your fuel tank, sealing leaks and preventing contamination. Remember, following proper application techniques and manufacturer guidelines is essential for maximizing the long-term effectiveness of the chosen fuel tank sealer.

Frequently Asked Questions

Can Fuel Tank Sealers Be Used on All Types of Fuel Tanks, Including Those Made of Plastic or Fiberglass?

Yes, fuel tank sealers can generally be used on various types of fuel tanks, including those made of plastic or fiberglass. It is important to ensure compatibility with the specific material of your tank for optimal results.

Are Fuel Tank Sealers Safe to Use With All Types of Fuel, Including Ethanol Blends and Other Additives?

Yes, fuel tank sealers are generally safe for use with various fuel types, including ethanol blends and additives. However, it's crucial to follow product instructions carefully to ensure compatibility and optimal performance without risking damage.

How Long Does It Typically Take for a Fuel Tank Sealer to Fully Cure and Provide a Permanent Seal?

Typically, it takes a fuel tank sealer a few hours to fully cure and provide a permanent seal. Make sure to follow the manufacturer's instructions for the best results and to ensure a long-lasting fix.

Can Fuel Tank Sealers Be Applied to Tanks That Are Already Rusted or Corroded, or Do They Require a Clean Surface to Work Effectively?

Yes, fuel tank sealers can be applied to tanks that are already rusted or corroded. However, for them to work effectively and provide a permanent seal, it is recommended to clean the surface thoroughly before application.

Are There Any Special Precautions or Safety Measures That Need to Be Taken When Applying a Fuel Tank Sealer, Such as Ventilation or Protective Gear?

When applying a fuel tank sealer, always prioritize safety. Proper ventilation is essential to prevent inhaling fumes. Wear protective gear like gloves and goggles to shield yourself from chemical exposure. Follow instructions carefully for best results.


In conclusion, choosing the right fuel tank sealer can help extend the life of your vehicle by preventing leaks and corrosion. Consider factors such as compatibility with your tank material, ease of application, and durability when making your selection.

Whether you choose POR-15, KBS Coatings, Kreem Products, J-B Weld, or Northern Fuel, a high-quality fuel tank sealer can help maintain the integrity of your vehicle's fuel system for years to come.