A pump will suck from whatever source is the easiest to obtain.
Sucking air from an open air line is certainly easier than water from the bottom of the hull. Also when the boat leans and moves, there is less water pressure on that hull opening, by a small amount. Same idea as an airplane wing.
Could be just enough for the air to be ingested from the open air line.
Definitely worth a try to close the air line and try again.
Good job on the flush.
__________________
Bill L.
1972 Ericson 27
Hull #61
Atomic 4
Last edited by CajunSpike; 05-13-2018 at 10:19 PM.
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