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Apr 11, 2013 at 20:29 comment added Daniel Jour Yes, you are right. The (huge) gap and observing the tilt (when running dry) mislead me. Actually air was the problem: The pump has an air vent, but its not placed very well.
Apr 11, 2013 at 20:26 vote accept Daniel Jour
Apr 9, 2013 at 23:59 history answered ratchet freak CC BY-SA 3.0