wrote:

I just bought a new boat (to me) and have some head questions.

Hoooboy...
Head - Jabsco manual head

Now my problems and questions:

1. My toilet is filling up with water after it is pumped dry.

Most likely that's because the toilet is below the waterline, there is
no vented loop in the head intake, and you're leaving the pump in the
"wet" mode. See (download and print) the installation instructions and
operation manual for your toilet he
http://www.jabsco.com/prodInfo/overv...10-0000_ds.pdf


2. My holding tank seems to be filling up a lot faster than it should.
I have about a 20 gallon holding tank and it is full after a day sail
with light use. Keep in mind this includes a week's worth of sitting
without use.

Always flushing only in the "wet" mode and leaving the head intake
seacock open will do that.

3. I'm not familar with one part of the unit...Right next to the head
there is a manual pump. A hose comes in through a thru-hull and does a
loop that wraps back through the pump and to the holding tank. Is this
to pump out of the tank to the lake or the opposite?

I'm not sure from your description of it. Can you email me a photo or a
sketch of the installation? peg(dot)hall(at)sbcglobal(dot)net.

Any help would be appreciated.

Start by reading what passes for a manual at the link I gave you. I'll
be glad to answer any more questions after you've read it (and I'm 99%
sure your first will be "what's a vented loop?")

--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/store/custo...0&cat=6&page=1
http://shop.sailboatowners.com/books...ku=90&cat=1304