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Rocter:
Thanks! I was away from the boat (I live in the mountains) and had a mechanic check the siphon...he took out a pvc that was mounted between the exhaust manifold and the mixing elbow...no valve whatsoever in that...and installed another "antisyphon" loop...which looks pretty much the same to me; a short hose going up, a fitting, and another coming down to the elbow, with a small tube clipped to the firewall with one end open. I confess I don't understand how that works, and my Yanmar documentation doesn't show anything like that. It was actually more than a drip; there was water standing in the manifold and what was dripping was leaking out of the filter cover....
Chuck
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