I'd just about bet that there is either a hole in the diaphragm, or an air leak in the pipe between the pump and the inlet manifold. sounds exactly like the rack is going in too far and not returning unless you pull the stop. the rack must be free by the sound of it, but it seems that the vacuum system is not pulling the rack back. Pull the diaphragm right out and have a good look at it. plus make sure that the diaphragm is seating nicely in the chamber on clean surfaces. All the best, Rex
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