How to solve the breather pipe pressurising the water tank

Pascal's barrel did more than flex! Why not Google it and see.

To be fair, a lot of the issue is about air locks rather than pressure or force. My tank tells me it's full with a hearty "clunk" as it pants outward (but doesn't burst). Good luck and good humour to all. ��
 
I was wrong about the importance of atmospheric pressure. I just got thinking about syphons and the way the water finds a level at which it rests but that is due to its connection to the rest of the water column.
Pressure at depth in a liquid is given by density x depth x g. The mass or volume of liquid is not in the equation. If you have a vertical meter of water, the pressure at the bottom is 0.1 atmospheres regardless of how wide that column of water is. So with the breather blocked through the last fillings overflow and the filler backed up (I re measured yesterday and it is 5 cm id) there is ample pressure from the water column to deform the tanks.
 
Polly1 said:
I was wrong about the importance of atmospheric pressure. I just got thinking about syphons and the way the water finds a level at which it rests but that is due to its connection to the rest of the water column.
Pressure at depth in a liquid is given by density x depth x g. The mass or volume of liquid is not in the equation. If you have a vertical meter of water, the pressure at the bottom is 0.1 atmospheres regardless of how wide that column of water is. So with the breather blocked through the last fillings overflow and the filler backed up (I re measured yesterday and it is 5 cm id) there is ample pressure from the water column to deform the tanks.
Click to expand...

If you were on planet with no atmosphere would a syphon still work?
 
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