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  1. S

    4.3 MPI engines sputters when attaching rabbit ears for flushing

    Have you turned the water on when the muff wasn't on the outdrive, to see if it's coming out freely? Yes: Water is coming out freely and exits properly near Transom, both sides equally. standard garden hose about 25 ft. I have not tied to open the fuel filler cap. Worth a try I suppose.
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    4.3 MPI engines sputters when attaching rabbit ears for flushing

    temp was in 80's, Not overly hot. When starting and stopping the engine compartment cover is wide open to ventilate as a precaution. Same when back at storage area. Not sure about fuel line size, that was copied from the description online. I am going to try a few more experiments. E.g. I am...
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    4.3 MPI engines sputters when attaching rabbit ears for flushing

    . As described in the mercruiser service bulletin from 1999 due to ethenol blended fuel and hot bilge temperatures, both engines were vapor locking following a short sit. This system was the fix. Simple plug and play system if you have 3/8in fuel line. Mine is 5/8 so I had to purchase the 3/8...
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    4.3 MPI engines sputters when attaching rabbit ears for flushing

    Mercury Mercruiser - Boost Pump Kit - Fits MCM/MIE 4.3L, 5.0L, 5.7L, 6.2L EFI/MPI Engines - 862264A7
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    4.3 MPI engines sputters when attaching rabbit ears for flushing

    Thank you, To try and answer your questions. I had it at MerCruiser shop. According to them they were able to replicate the issue. They said that the fuel pressure was indeed low after it sat and then started to sputter. According to them, i need the MerCruiser fuel booster pump. Approx. 1k...
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    4.3 MPI engines sputters when attaching rabbit ears for flushing

    Hi yes impeller and engine serviced recently by dealer. the issue is strange. For example, I ran the boat for couple of hours in water, stopped for lunch for 45 minutes, started and ran fine. Put boat on trailer and took back to storage, 25 minute ride. Put on rabbit ears and within a minute...
  7. S

    4.3 MPI engines sputters when attaching rabbit ears for flushing

    Still having issue seems to occur only when I attach the rabbit ears and the engine is hot. It almost feels like a vapor lock engine spots and eventually dies. Once the engine cools, it starts up with no problem.
  8. S

    4.3 MPI engines sputters when attaching rabbit ears for flushing

    Raw water raw water cooled , water Flow from garden hose not full force .
  9. S

    4.3 MPI engines sputters when attaching rabbit ears for flushing

    Hours 80 currently , it’s a 2015
  10. S

    4.3 MPI engines sputters when attaching rabbit ears for flushing

    Hours 50 and now has 80 hrs . Its a 2015 Tahoe
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    4.3 MPI engines sputters when attaching rabbit ears for flushing

    I have a 4.3 mpi, with about 80., I bought it with 50, and this is a crazy problem. Seems the engine can run fine, but then when I get it back to my parking area and attach the rabbit ears to flush, the engine starts immediately to sputter. Eventually it dies. However sometime later maybe...
  12. S

    Salt away

    Found out that there are baffles in the engine exhaust and they soap may have clogged the baffles which caused the engine to choke out. Once the soap fell off the baffles the engine went back to normal. It might’ve been like putting a banana in an exhaust pipe.
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    Salt away

    Yes I was thinking also that it has to be a sensor .
  14. S

    Salt away

    Does anyone know why when I hook up rabbit ears to my 4.3 l mpi and use salt away? It causes the engine to start to sputter and literally die. It only comes back normal after I continue flushing with freshwater. This is happened several times so I know something in the salt away is causing the...
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    Salt Away

    Does anyone know why when I used salt away with rabbit ears on my 4.3 l mpi it immediately caused the engine to misfire and die . Only after running fresh water and time did the engine return to normal. This happened 2x some k am sure the salt away was the cause . Any ideas why?
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