Permatex’s Fuel Tank Repair Kit eliminates dangerous welding. This complete kit contains everything required for making professional-quality permanent repairs in just minutes. It includes state-of-the-art components and easy-to-follow instructions with photographs to make quick permanent repairs to leaks in all types of metal fuel tanks. Use the fuel tank repair kit to repair cracks up to 4? (10cm) long and holes up to 3/8? (9mm) in diameter.