Abstract: A lantern and fuel system with a pump subassembly. The pump subassembly includes a beveled seat having an interior end with a cylindrical configuration constituting an interior guard with a first O-ring on the seat adjacent to the interior guard. The beveled seat has an exterior end with a cylindrical configuration constituting an exterior guard with a second O-ring on the seats adjacent to the exterior guard. The beveled seat has an intermediate guard on the seat between the first O-ring and the second O-ring.