A fuel can adapter is designed to be used with a fuel can having a neck that is internally and externally threaded. The fuel can adapter includes a plate having external threads for engaging internal threads of the neck, the plate including a hole. The adapter includes a sliding tube mounted to slide within the hole in the plate. The adapter includes an elbow mounted at an upper end of the tube, the elbow including an outlet. The adapter further includes a protrusion extending from the plate beside the hole. The elbow bears against the protrusion to exert a torque on the plate that threads or unthreads the plate from the neck of the fuel can.