Por 15 49208 Fuel Tank Liner; Used To Stop Rust/ Corrosion And Seals Pinhole Leaks For Fuel Tanks; 1 Pint Can Fuel Tank Sealer. Used For: Stop Rust/ Corrosion And Seals Pinhole Leaks For Fuel Tanks. POR-15 Fuel Tank Sealer was formulated and developed in our own laboratories due to the demand for a high-tech sealer impervious to all fuels.