Sierra Silverado 4000 1/4″ Fuel Line The Silverado 4000 fuel line is the best B1 fuel line in the market place.The Silverado hose has a small O.D., is extremely flexible and easy to clamp.Fuel Line is resistant to ethanol blended fuels and the gray color keeps hose cooler and helps prevent vapor lock.For strength and a weather and UV resistant CPE cover, Polyester reinforcement has it covered. Features: THV500 barrier layer Nitrile jacket Polyester reinforcement CPE cover EPA and CARB compliant Specifications: I.D.: 1/4″ For above deck primer bulb applications, and is not fire retardant.