In my experience, the most likely cause for a plugged vent line is spider
webs/nest or mud daubers having plugged the vent outlet. I work part time as
a dockmaster at our municipal docks - which is one of the few pump outs in
the area and sees a lot of traffic. We run into a lot of cases where the
vents are plugged on boats that have not been used for a few weeks. The only
cases I can recall of being unable to pump a tank were either plugged vents
on the side of the boat, or the occasional owner of a vacuum head who does
not turn off the vacuum pump (I understand there is no vent line in a
vacu-flush head system).

 

Not likely to find dried "material" in the vent hose. Unless you REALLY
overfill the tank there should normally only be liquid in the hose. The
solid "material" settles to the bottom.

 

Look at the vent fitting on the outside of your hull. It should have a piece
of screen inside of it to prevent spiders and wasps from getting into the
fitting. You will probably find mud or a mass of spiderweb material in the
opening, and blocking the vent.

 

 

Rick Brass

Washington, NC

 

 

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Jake
Brodersen
Sent: Sunday, November 03, 2013 9:29 AM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List water level in head/bowl

 

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

 

 

 

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