Glen-L.com

Looking for some input on where to install the fuel tank vent. Its the small post type used on most all inboards. I have attiched a pic of my deck and fuel fill. It turned out great but unsure where to put the vent. Would like it out of the way but still do it's job. Ready for any ideas guys and gals.

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A very good friend once told me it's not what you don't know that will get you....it's what you do know that ain't so

I put mine on the side of the boat as high as I could. But, there needs to be a loop in the line up higher than the vent. That way water can't back flow to the tank.

Bill

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Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

I plan to put my vent on the side just under the rub rail. The vent opening is on one side, so I'll be turning it aft to avoid any possible spray besides the loop inside. Someone mentioned using a check valve; but I don't think it's necessary.

I think your tank is under your bow, same as mine. In the picture in the link below if you look just aft of my registration numbers you will see the chrome vent sticking out. Thats the best place I could come up with for a bow mounted tank.
https://picasaweb.google.com/vupilot/Ga ... 0453825634

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My Zip build log...
http://www.vupilot.blogspot.com
http://picasaweb.google.com/vupilot/Chr ... O0x7SvsQE#

"Nothing screams poor craftsmanship like wrinkles in your duct tape."

Thanks guys I like the idea of not putting another hole in the deck. The under side is the way I think I'll go Capt. Woody

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A very good friend once told me it's not what you don't know that will get you....it's what you do know that ain't so

Vupilot: I think I'll go with the vent under the rub rail. Did you go through the shear or just the ply panel with a backing plate? I hate to compramize the shear but dont want to pull through the hull either. Capt. woody

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A very good friend once told me it's not what you don't know that will get you....it's what you do know that ain't so

Woody,
I went through the hull ply only, about an inch under the sheer. I then sealed the end grain in the hole with 2 coats of epoxy. When I installed the vent I used BoatLife caulk to seal it as well. The hose goes from the vent and first goes uphill under the deck to the strongback, then down to the tank. That way if any water finds its way past the screen in the vent it will drain back out the vent instead of getting into the tank.

-Chris

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My Zip build log...
http://www.vupilot.blogspot.com
http://picasaweb.google.com/vupilot/Chr ... O0x7SvsQE#

"Nothing screams poor craftsmanship like wrinkles in your duct tape."

That loop in the line is a good idea.
I bought a boat with three tanks. It was a Factory made boat. Atlas. and believe it or not, it had vents up high, but no loop or Float blocking the water from coming in.
In rough water I'd see a "Sheen" of fuel out behind the boat.
I had to ask, and learned the hard way.

If your loop gets fuel or water in the bottom of the loop, the tank wont vent without pulling that Liquid down into the tank.

If I ever do that again, I'll have some kind of Float/switch in the Vent line. So it will stay open until something like gush of Salt Water tries to go down that pipe. The float will drop down, close the Fuel line off, and let the Salt water go out a side hole.

Also, to help, put the Vent outlet up forward and as High as you can get it.
If your going to be diving under the water, the weight of the Water will force it's way past that loop.

I had water up over the gunnels frequently. Even up over the Cab.
Water's pretty heavy. It's gonna find its way down so don't give it any chance at all.
My last boat had a good, large, deep, water separator between the Tanks and the engine.
I was amazed at how much water came out of that thing every week.

I had mentioned earlier putting a check valve in the line. It will let the tank vent; but won't let anything come back through the line into the tank. Put it at the top of the loop so that any water that might come in will not sit inboard of that point and the flow will be back out the vent.

I am installing a above deck metal fuel tank, and wonder about this venting. It looks like the deck fill will be the highest point. I cant see any place that the vent would be higher than the fill; so when you fill it up you would spill out the vent before the fill, making a big mess every time you fill-up.
How do you guys handle this?

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God Bless our Troops; especially our Snipers

We installed a Fuel Whistle in the vent line. When you're fueling your boat, it makes an audible whistle as air escapes.
When your tank is just about filled, the tone of the whistle changes so you don't overfill the tank and cause a spill.

Green Marine Fuel Whistle

Note to Gayle : Very few retailers carry this item. Might be a great addition to the Glenwood Catalog ...

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Paul Kane Chelsea, PQ

Building the Glen-L Hot Rod : http://www.boats.chelseacoachworks.com

Great idea, Paul. That is a must have for my Zip. Thanks for sharing.

Roberta

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Roberta
Built Zip "Oliver IV" and Super Spartan "Jimmy 70"

is that whistler also a check valve? even if it whistles, can fuel get puked out the vent?

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God Bless our Troops; especially our Snipers

I had an hull vent in the Sea Ray I owned. The only advice I have is: Dirt dobbers love to build it them and stop them up.

The vent is to let the air out of the tank when you fill it. If you overfill the tank the gas will pour out the vent. The vent pipe should come out of the top of the tank so it will not pour out until the tank is completely full. If you stop filling when the pump clicks off you should not get any gas coming out of the vent pipe. It is the same as getting a gas bath if you keep filling your car after the pump clicks off.
BTW a check valve is used to stop the flow of water into the tank while letting the air, and gasoline too, flow the other way. It works the same way a check valve works in a bicycle pump. The air goes into the tire and the valve keeps it from coming back out when you raise the handle for the next pump. But this doesn't let air back into the tank when the fuel level drops .