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Fuel tank vents
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Ken O



Joined: 05 Mar 2014
Posts: 110
City/Region: West Yellowstone
State or Province: MT
C-Dory Year: 1990
C-Dory Model: 22 Cruiser
Vessel Name: Ravens' Roost
Photos: Ravens’ Roost
PostPosted: Tue Jan 05, 2021 4:11 pm    Post subject: Reply with quote

I like the idea of eliminating the outside/topsides vent that could allow water in. I see that West Marine sells several of these. I understand the concept of a gas vent is that it allows air in as fuel is used, and allows air (and fumes) out when filling the tank or when the tank warms up. Where does this type of filler vent gas fumes? Could the fumes be vented into the cockpit? Gasoline fumes are heavier than air.
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Robert H. Wilkinson



Joined: 26 Jan 2011
Posts: 1231
City/Region: Port Ryerse
State or Province: ON
Vessel Name: Romakeme IV
Photos: Romakeme IV
PostPosted: Tue Jan 05, 2021 6:21 pm    Post subject: Reply with quote

Ken, the venting is through the gas cap itself. To comply with CARB & EPA USCG standards July 2011 the tank isn't actually "vented". VOPR stands for vacuum over pressure - basically when running engine the cap allows air in as a vacuum is created using fuel. On a hot day when fuel is expanding and boat not running - the cap allows the resulting pressure to escape. When pressure inside the tank is equal to the pressure outside then essentially the tank is sealed. The vent hose from the top of the tank terminates inside the fill neck at the top - close to cap.

If you study the 2 pics in my album close you can see hole in fill neck where vent is attached and interior of cap. Here is a link to one pic - once you clic on it should be able to follow arrows to second pic. If you clic on the pic a second time it will enlarge.

http://www.c-brats.com/modules.php?full=1&set_albumName=album1611&id=IMG_1472_1&op=modload&name=gallery&file=index&include=view_photo.php

Regards,

Rob

PS - here is the link to second pic

http://www.c-brats.com/modules.php?full=1&set_albumName=album1611&id=IMG_1471_1&op=modload&name=gallery&file=index&include=view_photo.php

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Ken O



Joined: 05 Mar 2014
Posts: 110
City/Region: West Yellowstone
State or Province: MT
C-Dory Year: 1990
C-Dory Model: 22 Cruiser
Vessel Name: Ravens' Roost
Photos: Ravens’ Roost
PostPosted: Tue Jan 05, 2021 9:30 pm    Post subject: Reply with quote

Hi Rob, That sounds like the solution then. Where did do buy your fillers?
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Robert H. Wilkinson



Joined: 26 Jan 2011
Posts: 1231
City/Region: Port Ryerse
State or Province: ON
Vessel Name: Romakeme IV
Photos: Romakeme IV
PostPosted: Tue Jan 05, 2021 9:47 pm    Post subject: Reply with quote

Ken, they were original equipment on my boat(not a Cdory Cry ).

Thataway says Perko makes several that would work for you. You can check at whatever marine supply stores are in your area. Also could be purchased on line.

Rob
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digger



Joined: 02 Nov 2003
Posts: 496
City/Region: Spokane
State or Province: WA
C-Dory Year: 1993
C-Dory Model: 22 Angler
Vessel Name: C-Sik
Photos: Snoopy-C
PostPosted: Tue Jan 05, 2021 10:17 pm    Post subject: Reply with quote

I bought vent assemblies that had a built-in loop in the hardware. A heavily loaded c-dory with oem vents pointing downward will allow water intrusion in rough seas. I also put an upward loop in the bilge line so it would stop inflow under similar conditions. It keeps the floor dry unless it is raining, and then a bit will come back thru the pump when pumping stops. It was made by Atwood
https://image.sportsmansguide.com/adimgs/l/1/159291_ts.jpg
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