Imperial Auto leak-off lines are used to carry fuel that is leaking or dripping from the fuel injectors to a safe location, such as a fuel tank or a fuel return line. The purpose of the leak-off assembly is to prevent fuel from being wasted or being released into the environment, and to ensure that the fuel is properly contained and routed to a safe location. Imperial provides fully tested leak off lines in FKM/ECO, nylon and metal.