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 Question about Ventilation.		  New Topic  Topic Locked
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sodonnell
1st Mate

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76 Posts
Initially Posted - 01/21/2006 :  23:42:21  Show Profile
I have a 1980 C25 SK.
I'm trying to find how the ventilation is suppose to be setup.
My Port side vent opens forward and is fed into a flexible tube that just hangs in the port cockpit locker.
It looks like it has been cut or torn.
At the bottom of the cockpit locker it looks like other half of the flexible tube feeds through into the bilge area.

I stuck my head down there with a flashlight to see where it ran to and it looks like it feeds into the vent facing aft on the starboard side.

I know this can't be right.
How is it supposed to be hooked up?
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 01/22/2006 :  00:09:35  Show Profile  Visit Champipple's Homepage
I believe they dead end in the bilge area just to provide ventilation.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 01/22/2006 :  01:11:53  Show Profile  Visit Frank Hopper's Homepage
I think they are only on the older boats that have internal fuel tanks. So I assume it is intended to vent the fuel tank area.
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 01/22/2006 :  09:39:21  Show Profile  Visit Leon Sisson's Homepage
sodonnell,

What you describe seems to be Catalina's attempt at venting gas fumes in the earlier C-25s which didn't have a separate fuel locker. It didn't work. That's one reason the later boats have a different fuel storage setup. When I got my 1979 C-25, I found several unsuccessful attempts to seal off fumes originating in that dumpster sized port cockpit locker from getting into the cabin.

The quick and cheap solution to the gasoline fume issue in the earlier C-25s is to not store any gasoline in 'the dumpster.' Intead, use a portable fuel tank in the cockpit.

A somewhat more elaborate alternative is to install a built in fuel tank, which is what I eventually did. Before deciding to go that route, please be aware of the various safety codes that apply to fuel tanks permanently fitted below decks. Your insurance agent and surveyor will be glad you did. Since installling the inboard tank, I haven't had any problems with gas fumes (or cruising range).

When I installed the 12gal inboard tank, I removed and patched over those 'clothes dryer vents' on the aft corners of the deck, and relocated the stern docking cleats further aft where they are more accessable, and there are fewer things on deck to chafe any lines attached to them.



-- Leon Sisson
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 01/22/2006 :  12:57:30  Show Profile
>"I know this can't be right. How is it supposed to be hooked up"

That's exactly how they did it... was supposed to provide some sort of air flow through the dumpster... don't think it was very effective.

With my 3 gal Honda tank in the locker I haven't had any noticible fume problems... but it's always an issue that's in the back of my mind. I'm always careful to make sure the hose is coiled up above the fuel level in the tank so it can't siphon.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.