Quote:
Originally Posted by gantt
........... What am I doing wrong?
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Are you sure that the connecting hoses and connections are free of air leak?
Same will happen to the same column of liquid if you reverse the connections?
If the vacuum created in one manifold respect to the other has a difference in inches of water that is actually so big, you may have a problem of leaking valves, as explained above, or something as simple as a leaking manifold.
Please, take a look at these:
http://www.dansmc.com/balancecarbs.htm
http://www.dansmc.com/leakdown.htm