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  1. W

    Frost Plugs

    I have a heat inductor at work. Do these studs usually break on boat exhaust manifolds?
  2. W

    Frost Plugs

    Good points. I really need a win here. Thank you for your information. I’ll repost when I get them back in. The one plug is between the the engine and mount. Not sure how easy that will be to pop back in.
  3. W

    Frost Plugs

    Thank you for the optimistic and prompt reply. I was having a terrible week at work this was the icing on the cake.
  4. W

    Frost Plugs

    Hello everyone. Thanks for taking the time to read this call for help. Boat hasn’t been out this season yet. Was doing a tune up on my 2001 4.3 mercruiser EFI. When I got to the right side (non starter side) I noticed the two larger frost plugs were out. My heart sank. I did winterize my boat. I...
  5. W

    Intermittent Backfire 4.3 EFI

    So I’ve let the fuel filter solution settle and there is no separation of water at all. Is it possible the fuel pump is weak and needs to be replaced? Is the fuel pump for my engine located in the fuel tank or located on the engine itself? I do audibly hear my fuel pump when it gets power but it...
  6. W

    Intermittent Backfire 4.3 EFI

    Sorry have been working two jobs all summer. Haven’t been able to get to my boat till now. Just emptied my fuel filter contents into a glass jar and waiting the hour as suggested. My serial number is M009586. Will post a picture of the jar after an hour or so.
  7. W

    Intermittent Backfire 4.3 EFI

    Sorry my actual number is M009586
  8. W

    Intermittent Backfire 4.3 EFI

    Thanks for the advice. I’ll check the fuel in the am. My question is: wouldn’t the engine run consistently poor with water in the fuel?
  9. W

    Intermittent Backfire 4.3 EFI

    Checked the anti-syphon valve, seems to be moving without sticking or catching. Going to check the fuel in the filter. Also notice the spark arrestor pretty clogged with debris. Will clean that out tomorrow with some brake cleans. I appreciate all the help so far. I’ll look for that serial...
  10. W

    Intermittent Backfire 4.3 EFI

    I got that number from the vanity cover.
  11. W

    Intermittent Backfire 4.3 EFI

    Does the engine serial number determine if it’s TBI or MPI?
  12. W

    Intermittent Backfire 4.3 EFI

    My engine serial number is GM1009586. I don’t have a fuel pressure gauge at the moment. I will check my fuel filter contents and repost. I don’t know how to test a anti syphon valve.
  13. W

    Intermittent Backfire 4.3 EFI

    I’m new to this group. So forgive me if I accidentally leave out important information. Was referred to come here by a friend. I own a 2001 Campion Allante with I/O 4.3 EFI mercruiser. This Backfiring issue just started happening on my last cottage trip. While under load it will intermittently...
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