A nozzle-receiving assembly includes a housing including a fuel inlet that is configured to receive a first nozzle of a fuel dispenser in order to dispense fuel into a fuel fill pipe coupled to the fuel inlet. A door is moveably secured to the housing. The door is configured to be moved between an open position and a closed position. An additive inlet is secured to the door. The additive inlet is configured to receive a second nozzle of an additive dispenser to dispense additive into an additive conduit coupled to the additive inlet.