Electrokinetic pump designs and drug delivery systems

A fluid delivery system, comprising:

• a housing having a first chamber, a second chamber and a third chamber;
• an electrokinetic pump element separating the first chamber from the second chamber, the electrokinetic pump element comprising a porous dielectric material disposed between a pair of electrodes;
• a first moveable pump element separating the second chamber from the third chamber;
• a second moveable pump element defining a wall of the first chamber;
• a pump liquid in the first chamber;
• a storage liquid in the second chamber in contact with the flow-through pump element;
• a first outlet through a wall in the housing in communication with the third chamber;
• and a second outlet through a wall in the housing at the second chamber, the second outlet configured to allow the storage liquid in the second chamber to flow therethrough without flowing through the electrokinetic pump element as the first movable element moves towards the second chamber.