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    Fuel pump fault

    I figured as much, found a sierra brand on on Amazon for 27 bucks. Not terrible 🤷🏼‍♂️
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    Fuel pump fault

    Thanks, I looked on mercury marine online catalog and it gave me the 807057T looks like they are interchangable. Gonna hopefully settle all of this this weekend.
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    Fuel pump fault

    Would the fuel pump relay part number be 807057T and the fuse part number be 83296920? Just want to make sure. Thanks!
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    Fuel pump fault

    there any way you could explain the location of the can bus on a 2003 4.3 mpi? I have read other old old forums which say they had similar problems like I'm having and have replaced the fuel pump relay, with no fix, but they disconnected the can busses and reseated then which fixed their issue.
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    Fuel pump fault

    I
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    Fuel pump fault

    As he said if the mechanic did the wiggle test and it "passed" they would replace the relay. I guess I would have assumed the opposite
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    Fuel pump fault

    I guess I was just confused to why if it passes the wiggle test and doesn't misfire, how that confirms the relay is indeed bad. I would have thought that opposite honestly.
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    Fuel pump fault

    Thanks! Is the wiggle test explained in the service manual?
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    Fuel pump fault

    For my 2003 4.3 MPI they stated the 4 pin connector was for diagnostics at the first shop I took it to. I attached a pic of what it was, I have seen on newer models the diagnostic port does not look the same as the one on my boat. The mechanic who just ran diagnostics on it stated he used a...
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    Fuel pump fault

    I was simply trying to bounce some ideas around. I never meant to discredit your attempts to help out, nor did I feel like your ideas were wrong, I was just trouble shooting the way I know how, building ideas and sharing thoughts. My apologies. I appreciated your input.
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    Fuel pump fault

    I just wouldn't think a water pressure sensor fault would be dependent on the physical load on the boat though. I guess I won't be able to tell until I get another diagnostic on it. But I'd rather not waste another $100 if it's going to come back the same. I couldn't imagine a reputable mechanic...
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    Fuel pump fault

    So could possibly be a clogged filter not supplying the fuel demands necessary for proper operation while loaded down resulting in the computer assuming a failing fuel pump or other fuel delivery issues 🤷🏼‍♂️ just trying to think of the possibilities at the moment since it will be a while until...
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    Fuel pump fault

    Would there be any chance that a clogged fuel water separator filter cause a strange fault to occur? The beeps only seemed to occur when the boat is loaded down, never when it's just two people or so.
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    Fuel pump fault

    Okay, thanks for the tip. I tried getting it tested on the water, but the marinas diagnostics for the old type of connection that I have didn't work any more.. go figure. And I had the other mechanic test it off water and he said that was all that was stored unfortunately. I guess I will keep an...
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    Fuel pump fault

    That's the thing. The mechanic stated that Merc did away with the code numbers supposedly. He stated that when he ran the diagnostics it simply said fuel pump and nothing more. Which from what I have read is not an actual code that I have seen. And am unsure how there would not be a specific...
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    Fuel pump fault

    The motors S/N is 0M370012
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    Fuel pump fault

    Hello all, So during this season I had an intermittent soft alarm (2 beeps/min).This alarm would only occur over 4000 rpm and did not happen every time exceeding 4000 rpm. No noticeable performance issues. I took it to a local marine mechanic and they pulled the codes. They stated the code...
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    Mercruiser 4.3L serp belt cross reference

    Perfect, that's what I went with. Just odd that the Merc number on my belt would "...76-4" would convert to about 1940.56 mm even though the metric number on the belt is the 1938 mm. I'm sure with the adjustable tensioner pulley that the 3 mm will be able to be compensated for by raising or...
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    Mercruiser 4.3L serp belt cross reference

    Or would the Gates K060764 be a better fit since it is 76.4 inches long which I'm guessing is what the end of the merc. number means as well? I just don't understand why the belt on it states "6PK1938" and "57-863876-4" if they would be two different measurements in length. I'm just torn between...
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    Mercruiser 4.3L serp belt cross reference

    Excellent, thank you! So that one you posted from amazon would be a direct replacement for the Mercruiser part number 57-863876-4 that is currently on the boat? Also I have read some threads stating automotive belts have a tendency to create static electricity, unlike the marine grade belts. Is...
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