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  1. #1

    Default Anti-Siphon Valve Picture

    2004 350 Mag

    There's been a lot of discussion in the past year about the anti-siphon valves. So I figured I'd try to find it and take a picture. Below is my what I believe is my Anti-Siphon Valve. Not sure how to remove it other then unscrew it from the tank, if it wants to be unscrewed. I may have to modify a open-end wrench to fit in the space (Knuckles). Not sure of a P/N - it looks 3/8". Boat is on trailer for winter. Installation needs some some brush-on gas thread sealant. Thanks
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  2. #2

    Default Re: Anti-Siphon Valve Picture

    picture should be rotated 90 degrees clockwise

  3. #3
    Join Date
    Jun 2006
    Spotswood, NJ, USA

    Default Re: Anti-Siphon Valve Picture

    they are usually the very first fitting at the gas tank , they come in aluminum or brass and unscrew from the tank fitting.

  4. #4
    Join Date
    Jul 2008
    Northboro, Ma, USA

    Default Re: Anti-Siphon Valve Picture

    It will be a antisyphon valve ONLY if there is a sping loaded ball (check valve)
    Inside that fitting.
    If no ball and spring it is not a anti-syphone valve.
    Northborough Ma
    Helping others sometimes with an attitude....haha..

  5. #5
    Join Date
    Dec 2015
    maplevalley WA

    Default Re: Anti-Siphon Valve Picture

    While your at it pull the dip tube and check/clean the strainer at the same time?
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  6. #6

    Default Re: Anti-Siphon Valve Picture

    It's a FW boat so things may turn, if it was SW.... Concerned about overhead clearance. I only know tank dip tubes and sending units from the 60 -70's - enormous things.

  7. #7
    Join Date
    Sep 2008
    Maryland - USA

    Default Re: Anti-Siphon Valve Picture

    If you have one, its the brass fitting.....you only need it IF you fuel line run dips below the top of the tank....and most boats have them.

    The dip tube is also called the pickup tube - that connected to the aluminum fitting threaded into the tank bung in your picture - pull the anti-syphon valve and then unthread the tube's fitting - it should lift straight out...

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