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Old 10-22-2016, 10:06 PM   #6
LarryM
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City: League City, TX
Country: USA
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 936
Vented loops generally have a fitting containing a rubber duckbill valve. It blocks water from discharging while running, but allows air to enter when the engine stops to break any vacuum that could lead to engine flooding. In the event the duckbill becomes clogged, a vacuum and resulting siphon can occur. If, on the other hand, the duckbill leaks, it will behave exactly as you are observing.

These are easy to check or replace if accessible.

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