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-   -   Gas Overflow Check Valve (http://www.wakeworld.com/forum/showthread.php?t=796643)

grant_west 01-14-2013 11:47 AM

Gas Overflow Check Valve
My boat since day 1 has been plagued with overflow issues from the check valve. The check valve is a one way valve that lets the gas tank "Vent" but not suck in water. The problem is the vent sits atop the gas tank and the vent hole on the side of the boat is either at the same height or lower then the vent on the tank. I installed a plastic check valve a while back but it didn't seem to do much. I still have gas spewing out the side of my boat when I have a full tank and go around a right hand corner.
I'm asking for some advice on the proper way that a check valve system should be run or installed. I'm tired of having gas run down the side of the boat and eat away my decals ect.
Thanks in Advance

Bamabonners 01-14-2013 12:15 PM

what boat do you have? many people have found a simple fix for this on various brands.

grant_west 01-14-2013 12:28 PM

Sorry I should have listed it I have A 02 Air Nautique .thats a direct drive boat

gwnkids 01-14-2013 7:00 PM

This is what I used

grant_west 01-14-2013 9:22 PM

Gnkids: that looks like what I need I just placed a order for one.
How did you mount yours Vertical or horizontal.

gwnkids 01-15-2013 11:25 AM

I also relocated the vent up closer to where the observer seat is (we surf alot ant the rub rail it close to the water line) put a 90 coming down then a 90 out to the tank

grant_west 01-15-2013 12:22 PM

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Sorry fro the lame drawing

grant_west 01-15-2013 12:33 PM

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So the Idea will be to try and run the over flow line as close to the underside of the deck (highest point) and then back down and up to the over flow in the back. I know in the drawing Im showing the line running line 90's but it will swoop I dont like the Idea of gas sitting in the low point of the line. Can I run the Valve in a horizontal position???

grant_west 01-15-2013 12:38 PM

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gwnkids 01-15-2013 2:07 PM

The first example is the correct way. The valve has a ball inside that must be at a 55 angle to flow (roll) and seal properly.
I dont know if you can see the photos in this link but it will give you a good visual.


It has worked flawless for me. I trailer and after filling up I would always watch the gas pour out of the overflow, now it all stays in the tank.

grant_west 01-15-2013 3:10 PM

Looks like the check Valve you recommended is no longer available from Skidim
I got this email from them after I placed the order.

The Air/Fuel separator you ordered has been superseded with a less expensive, good alternative product, cost is just $24.99.
Item #31612. We no longer have the expensive one in stock. May we substitute for you?

I have the Attwood one right now. That's the cheeper one they are referring to.
Any ideas on another source

gwnkids 01-15-2013 3:27 PM

Bakes may have them


grant_west 01-15-2013 3:40 PM

Bryan; Thanks they have it

gwnkids 01-15-2013 4:22 PM

Anytime, you have helped us just nice to give back.

grant_west 01-29-2013 9:35 AM

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My Check Valve showed up yesterday.
Looking over the instructions, I orderd it from South Carolina and its made in Modesto Ca,
Lol I was 2 mins from the factory yesterday.

grant_west 01-29-2013 9:38 AM

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Looks like I'm going to have to install it in this Configuration. I'm going to try and come right out of the tank vent and install it at a 45 and them run the line down hill to the vent

grant_west 02-02-2013 10:13 PM

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Started installing

grant_west 02-02-2013 10:14 PM

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This is it on the mount

grant_west 02-02-2013 10:19 PM

This is its location not Ideal but it will do the trick

grant_west 02-02-2013 10:37 PM


grant_west 02-03-2013 8:11 AM

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The top of the check valve is at the highest point and the hose slopes back to the vent with "no trap"
Or Dip up and down in the line

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