T&T: Another Vacuflush problem

[Henry Dennig]

Our trawler has 3 vacuflush heads.  All three keep running.

Yesterday we pumped out.  The heads worked fine all day after the pumpout.
Last evening all three just kept running after flushing.

The only way to stop them is to pop the breakers.  The heads use a standard
vacuum generator.  Each generator connects into a Y that ends with a common
hose to the holding tank.

Tonight I replaced the vent filter.  No change.

I then disconnected the "guest" vacuum generator hose, and ran a plumber snake
down the hose, through both Ys.  Put it all back together...No change.

Suggestions?  Before i am divorced!
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