| I would love to see a picture of the un-level leaf trap port. It is hard to imagine how the molded frame could be that incongruous. To test that, I would un-screw lid, leave the O ring in pump frame then put a 1/4 inch plate of clear plexiglass over the entire opening with some water on O ring. Press down on plate slightly to see if there is proper seating 360. If that appears to be ok, the channel the O ring seats in must be compatible with O ring or visa versa. The thing I do not understand is if the impeller is creating all this vacuum during operation, the more the better. It should make the lid pull tighter against the O ring 'seating' making it imposible for air to pass by. It almost sounds like there is some problem with wall thickness of pump housing or screw lid that is disorting under vacuum suction which would be very unusual. The O ring is 'gauged' wrong or injection mold 'shoulders' that need to be milled for perfect mate with lid. I am going to check one out, this has gotten curious.
As far as the rim being lower on inside of O ring channel would depend on design. Does the lid have the same configuration only opposite so it mates and seats properly with frame. Take out O ring and put the two together. That shallow inside shoulder of rim could also distort the O ring under vacuum causing a seating problem. |