On the water issue it sounds like the joker valve is failing - included in the 
basic rebuild kit.  The water is coming from what was left in the hoses.  
Wouldn't worry about the thru hulls.  

No idea on the vent - perhaps disconnect and run a smaller length of hose 
through it?

John


Sent from my iPad

> On Nov 3, 2013, at 9:08 AM, David Knecht <davidakne...@gmail.com> wrote:
> 
> 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
> 
> <pastedGraphic.tiff>
> 
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