David,
A leaking joker valve may allow the bowl level to rise over time. If your head is below the waterline, I suppose it's possible for some intake water to seep through the pump, but I've never seen that happen. Since you have closed the through hull, this is not the problem for you. As the level in the holding tank rises, it puts more pressure on the joker valve, which may cause it to leak more. If your vent is plugged, it may be better to replace than try to clean it. You could always try attaching a hose firmly to the vent hose. Just remove it from the through hull and seal it temporarily. It may not take much to clear it, depending on what is causing the clog. Dried material may need to soak before it clears out. Jake From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David Knecht Sent: Sunday, November 03, 2013 9:09 AM To: CnC CnC discussion list Subject: Stus-List water level in head/bowl I have noticed that the water level in the bowl of my head tends to increase over time. It is not close to overfilling, but when I get to the boat is is several inches higher than when I left the boat and after pumping it out, over the course of a day on the water, it is higher at the end than the beginning even when not used. The through hull valves are all closed and the pump valve is in the tank/closed position. I can't see how the throughhulls could be leaking so the only thing I can imagine is fluid leaking from the holding tank back into the bowl. The holding tank is under the sink on this boat and so the fluid level is well above the level of the bowl. Probably unrelated, but when I had the tank pumped yesterday ( the new free pumpout boats in our area are fantastic!!), the pumper told me the vent tube was likely plugged because he got vacuum on the pumping system. What is the easiest/best way to clean out that tube? Thanks- Dave David Knecht Aries 1990 C&C 34+ New London, CT
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