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    Merc 8.2l guardian seawater pressure fault code 328

    It’s closed cooling as are all 8.2’s. The poppets are for draining sea water to winterize which I don’t need to in SC. I think you are thinking about a very different setup.
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    Merc 8.2l guardian seawater pressure fault code 328

    If the poppet valves were bleeding off I would see it in the bilge, but the bilge is dry.
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    Merc 8.2l guardian seawater pressure fault code 328

    So the trim position reads normal and changes as it should when trimming the drive. It’s only in the fault freeze frame that I see the crazy reading. When I rebuilt the pump I used the Merc kit with its new wear plate- it looks perfect. The boat only has 280 hours total.
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    Merc 8.2l guardian seawater pressure fault code 328

    I have a 2013 8.2 and I am getting a repeated guardian code 328 which is for low sea water pressure. I have replaced the raw water impeller (turned out the old one looked fine) and installed a new pressure sender. I am getting around 5 or 6 psi when cruising. I have a Rinda tech tool and when...
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