FASS RK04 Dodge Cummins Replacement System Relocation Kit 2003-2004FASS Fuel Systems 2003 2004 Dodge Direct Replacement Systems Relocation Kit (RK04), Part No: RK04 Our Direct Replacement System Relocation Kit allow for your new DRP System to be placed further back, closer to the fuel tank. This will reduce the distance the System needs to pull fuel from the tank while under vacuum and instead allows the System to push the fuel under pressure to your Cummins engine. The number one reason the factory Systems fail is