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Thread: Fuel tank breathers

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    Patrol God threedogs's Avatar
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    Fuel tank breathers

    Hi again just watched a piece on 4WD Pro Tips on Fuel Tank breathers.
    Has anyone done this and on what model and engine.
    I know we all do our diffs , but even this is the first time I've heard of extending the fuel tank breather tubes
    Mods feel free to move if its in the wrong section
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    The 747 Winnie's Avatar
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    Quote Originally Posted by threedogs View Post
    Hi again just watched a piece on 4WD Pro Tips on Fuel Tank breathers.
    Has anyone done this and on what model and engine.
    I know we all do our diffs , but even this is the first time I've heard of extending the fuel tank breather tubes
    Mods feel free to move if its in the wrong section
    Your fuel tank breathes into the filler neck which is sealed so why move it?

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    Patrol God threedogs's Avatar
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    Guy on 4wd pro tips suggested it would be better extended for some reason.
    No idea why
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    Patrol God nissannewby's Avatar
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    Quote Originally Posted by Winnie View Post
    Your fuel tank breathes into the filler neck which is sealed so why move it?
    They have external breathers mate. They are generally a little plastic looking thing near the filler.

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    The 747 Winnie's Avatar
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    Quote Originally Posted by nissannewby View Post

    They have external breathers mate. They are generally a little plastic looking thing near the filler.
    Mine definitely doesn't

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    Patrol God nissannewby's Avatar
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    Quote Originally Posted by Winnie View Post
    Mine definitely doesn't
    They have to breathe mate. If they cant breathe and the tank is completely sealed you will actually starve for fuel as the tank will pull a vacuum and the fuel just stops flowing.

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    Administrator AB's Avatar
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    Yeah he's right Winnie, you need to replace the space inside the tank when fuel gets taken but the breather is not near the top of the neck on ours. Must be further down the filler or on the sender unit.

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    The 747 Winnie's Avatar
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    Yeah makes sense... I did not see one when we did our install? Our second tank doesn't have one, but it is breathed to the main tank so could share?

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    Administrator AB's Avatar
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    Quote Originally Posted by Winnie View Post
    Yeah makes sense... I did not see one when we did our install? Our second tank doesn't have one, but it is breathed to the main tank so could share?
    Yep that's why there's a breather from main to aux. fuel from aux to main gets air from main to aux to replace space when transferring.

    Must be on top of the main tank or sender or in the original filler further down mate.

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    Moderator MudRunnerTD's Avatar
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    The breather is up next to the filler neck in the wheel arch, it has a 180 bend and faces downwards. It has a larger hose on the end and acts like a Bell. If it went underwater it would create an airlock. I can't think why you would extend it.
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