I need all the help i can get. I know sap lifters can be a problem but i need to use them. I have two small lapierre, (500 tap) sap lifters and they are both not working 100 % same problem on both My problem is that the sap fills up in the bottom chamber until it starts pushing the float up and starts to create a leak which is the way it is suppose to work. But it also shuts the blue rubber flap between the two chambers which keeps more sap from running into the bottom chamber and so the float never pushes the valve all the way shut. And the sap will not get pumped out of the bottom chamber. I am lifting less than 15 feet and am running about 26" at the lifter. I have tried everything that i know of and it is still not working if anybody knows anything about these things I would be glad to know about it. Thanks for your help in advance.