OK class lets put on our thinking caps
What I'm thinking................Im not asking how you would transfer sap from tank to tank or if a pump would be better. I want to know if this would work. I'm going with 3 cage tanks at my two collection points. I use a 2" flex pipe between the tanks connected by cam-loc's at the drain ports. They will freeze up st times and then my 3 tanks become only one when they freeze up. I have had the single tank over flow because of the loss of volume.
Now work with me here. I want to make a secondary siphon tube between the tanks that when the first tank get almost full it will spill into a siphon tube transferring sap from tank 1 into tank 2 then when tank 1 and 2 get almost full they will then transfer into tank 3. NOW follow me on this I can do it with simple bulk head fitting located about 4" from the top of the tanks and just have all the tanks connected fo once one is full then it fills #2 and then once 1 and 2 are full it will go to #3. OK easy.
Now what if I connected all the tanks that have the bulk head fittings with transfer pipes fitted with internal down tubes would they create a siphon effects pulling the sap from tank to tank??