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  1. #1
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    New 4 stoke/Anti Siphon Valve question

    Current motor SN 2B402296-Pro XS 250. I had issues with this motor losing prime. The dealer in searching for a solution took out the anti siphon valve on the fuel tank. The problem was later found to be a gasket in one of the pumps or something. He never put the anti siphon valve back in. Boat has run with no problem since. Now I am repowering with the new 4 stroke Pro XS. I read the posts re the new motor not needing a primer bulb. That made me think the lack of the anti siphon valve might be an issue. Any thoughts? Thanks all.

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #2
    You should have an anti-siphon valve (or device). Information on what the current boat is (and it's fuel system type) may also prove helpful here.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

  3. Member
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    #3
    It is a 2017 Legend V20 with a belly tank.

  4. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #4
    Have an anti-siphon valve reinstalled- this should prevent potential problems with fuel being pulled back into the boat tank.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

  5. Member
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    #5
    thank you