On my LF38, all three tanks have their own individual vent as they should.  The 
vent line follows the inlet hose and exits the hull just below each fill 
connection on the deck.  The original vent lines are 3/8" gray plastic piping.

A good venting system is necessary to get good flow into and out of the tank as 
well as insuring that the water pump does not pull a vacuum on the tank and 
cause it to implode--I have seen this happen on poorly vented holding tanks 
when emptied.

Bob
LF38 "Rainy Days"

On Sep 8, 2015, at 2:55 PM, Josh Muckley via CnC-List wrote:

> So I'm doing some water tank work and I've confirmed what I already 
> suspected.  My tanks are cross vented to one another through a low point 
> loop.  It appears that I could in theory fill all my tanks from one deck fill 
> port despite having a fill port for each of my tanks.  I'm thinking that 
> tracking tank level is a challenge when they are all sluicing between one 
> another.
> 
> This doesn't seem advantageous.  Why would the manufacturer do this.  Is 
> there a problem with me undoing it?
> 
> Josh Muckley
> S/V Sea Hawk
> 1989 C&C 37+
> Solomons, MD
> 
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Bob Boyer
S/V Rainy Days (1983 C&C Landfall 38 - Hull #230)
email: [email protected]
blog: dainyrays.blogspot.com

"There is nothing--absolutely nothing--half so much worth doing as simply 
messing about in boats." --Kenneth Grahame

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