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Thread: Fuel tank vent questions?

  1. #1
    Team Dirt Bag Intern NUTTZ
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    Fuel tank vent questions?

    My fuel tank vents were mounted on the side of the hull about 1 inch above water line. I didn't like that because I was worried about water getting into the fuel tank. I have already changed the 5/8" hose to ? and am wondering where others have their vents. I plugged the old holes on my hull rebuild. Thanks Jason.
    Heavy Lake Lay Up Family Boat Ready To Race Any Takers

  2. #2

    Re: Fuel tank vent questions?

    Some caps are self venting....as far as I know mine are

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    Just call me "Infidel" Site Admin David's Avatar
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    Re: Fuel tank vent questions?

    mine too
    Nationwide Insurance Agent www.DavidSantanaInsurance.com Office: 916-429-4741
    Fax: 916-467-4499 Cell: 916-517-9325 Email: santad2@nationwide.com

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    Re: Fuel tank vent questions?

    Excellent!, thats what I wanted to hear! Less mess less worry. Just wanted to know they work.
    Heavy Lake Lay Up Family Boat Ready To Race Any Takers

  5. #5

    Re: Fuel tank vent questions?

    I have the vented caps as well. Sux when you're parked downhill with a full tank though!!!
    ****Disclaimer - I'm far from being an expert so you may want a second opinion!****

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    Just call me "Infidel" Site Admin David's Avatar
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    Re: Fuel tank vent questions?

    Quote Originally Posted by wolfie link=topic=695.msg6936#msg6936 date=1302673003
    I have the vented caps as well. Sux when you're parked downhill with a full tank though!!!
    Ya it does, or just a hot day and the fuel expand!!!
    I've learned that when the pump stops I don't top it off and leave a little room for expansion...
    Nationwide Insurance Agent www.DavidSantanaInsurance.com Office: 916-429-4741
    Fax: 916-467-4499 Cell: 916-517-9325 Email: santad2@nationwide.com

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    Kona Kandi's Avatar
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    Re: Fuel tank vent questions?

    That works every time.
    It doesn't really matter whether you win or lose...
    as long as you look good doing it.

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    Re: Fuel tank vent questions?

    Quote Originally Posted by "THE ADVOCATE" View Post
    My fuel tank vents were mounted on the side of the hull about 1 inch above water line. I didn't like that because I was worried about water getting into the fuel tank. I have already changed the 5/8" hose to ? and am wondering where others have their vents. I plugged the old holes on my hull rebuild. Thanks Jason.
    The problem with the fuel tank vents in a boat is.....fuel vapor is more heavy than air. In a car under the engine and fuel tank is fresh air and the vapor can go there, but in a boat it will stay in the bilge.....a little spark and that was it.
    The vent to the outside is o.k., if there is a valve in the hose that let go expanding gas to the outside and blocks anything to go inside. A second vent is needed inside the boat at a place where it's protected from splashing water, with a valve the opposite direction to give air streaming into the tank to compensate the used up fuel.
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    Rob Hawes White Lightning's Avatar
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    Re: Fuel tank vent questions?

    What I did in my Kona was: first I replaced the vent screen on the outside of the hull and pointed the screens toward the rear, one at 2 o-clock and the other at 7 o-clock. Then on the inside I replaced the vent hose with a piece of fuel tank vent line (either 5/8" or 3/4" I cant remember what size fit it) and made a big loop in it and then into the tank. What the loop does is prevent any liquid (either gas or water) from getting in or out. If any water gets into the loop it just sits there until it evaporates, same with the gas, it'll just sit there and let the fumes push past what ever liquid is in there and vent. Eventually anything that's in the loop evaporates, meanwhile it acts as a p trap and won't let in any debris (dust and such). Hope that helps.
    Rob
    Rob Hawes-Anchorage Rod Works-Anchorage, Alaska
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  12. #10
    NUTTZ
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    Re: Fuel tank vent questions?

    leave a high spot in the vent line to keep the water out, or use a vented cap. never vent a gas tank inside a boat.
    Never Drive Faster Than Your Guardian Angel Can Fly.

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