Embodiments of sequenced foam pumps, refill units and dispensers are disclosed herein. One exemplary refill unit includes a container for holding a foamable liquid and a sequenced pump. The sequenced pump has a housing with a chamber located within the housing. There is an air inlet and a liquid inlet into the chamber. A hollow valve stem is movable within the chamber. A sealing member forms a seal between the valve stem and the chamber. When the valve stem is in a first position liquid flows into the chamber and air in the chamber flows into the container; and when the valve stem is in a second position, the sealing member seals off the liquid inlet, and air travels through the air inlet and mixes with the liquid in the chamber. The air and liquid mixture travels through the center of the valve stem and out of an outlet.