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  1. K

    2003 5.0L V8 mercruiser backfire

    It was the anti siphon valve. Issue gone after replacement.
  2. K

    2003 5.0L V8 mercruiser backfire

    In my original post, Last year replaced distributor, coil, and ignition module, and had carburator professionally rebuilt. This year replaced solenoid and ignition switch before taking it out the first time. I had a full tank of gas when I replaced the fuel water separating filter and it ran...
  3. K

    2003 5.0L V8 mercruiser backfire

    No. Only recently.
  4. K

    2003 5.0L V8 mercruiser backfire

    I replaced the water separation fuel filter a month ago. The gas inside looked clear.
  5. K

    2003 5.0L V8 mercruiser backfire

    I looked it up. I'm going to replace the antisyphon value and see if it makes a difference. I'll make sure hte screen at the end of the tube is clear of crud.
  6. K

    2003 5.0L V8 mercruiser backfire

    Is that on the tank, easy to replace?
  7. K

    2003 5.0L V8 mercruiser backfire

    Last summer (2023) engine wouldn’t start. First replaced distributor and coil, but turned out to be ignition module which was also replaced. At the same time I had the 2brl carb rebuilt professionally. Used the boat 2 or 3 times after and it ran great, best it has in years. After winter...
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