I've read the link, combat, many times in fact. I have the page saved in my favorites. I have tried the float lever at several different heights, and nothing changes. But I will try again. I have also double checked the orientation of the gaskets and films on both the pump and the diaphragm side, and all is well. I have also started another thread on the topic so as not to detract from your testing. By the way, this is a Zama carb, did I mention that?