Sierra 116-337-0560 516 Low Perm Fuel Line Sierra fuel line is OEM compatible. This low perm fuel line has a small outer diameter making it flexible and easy to clamp. This outboard fuel line is resistant to ethanol blended fuel and a THV barrier to prevent permeation. This B1 fuel line is both EPA and CARB complaint. The fuel hose is gray in color to help keep it cooler and prevent vapor lock. This hose is for above deck primer bulb application and is not fire retardant. Boat Fuel Hose Features