VersaChem, Permatex and Eastwood are three companies that make fuel tank leak repair kits. The VersaChem repair kit is suitable for gasoline and diesel fuel tanks. The repairs can take about 20 minutes, but the cure time is 1 hour.
Permatex also offers repair kits that are useful for different types of metal tanks. The repair can be done at an optimum temperature range of 10 to 24 degrees Celsius. This product can be utilized on cracks that are up to 4 inches long.
The Eastwood Company offers a repair kit for motorcycle gas tanks. The product is used for minor leaks and to keep rust from entering the fuel system.