Dee Zee Auxiliary Fuel Line Connector Kit - Gives you the ability to refuel your diesel fuel tank via gravity feed system. Connect to your Dee Zee Auxiliary Tank (sold separately) to your vehicle's fuel line to refill your tank when needed. All hoses and mounting hardware included. Diesel fuel valve must be closed during vehicle operation and only opened to gravity feed the vehicle diesel tank during stops. Continuous fuel transfer to the vehicle tank may cause check engine alarms in newer vehicles. Some cutting may be required of the OEM fuel hose. Listed for diesel fuel operation only.