1991 ski natique.. ground/relay or fuel hydrolock?

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  • Justinbones
    • Jul 2024
    • 1

    • BC

    • 1991 ski Nautique

    1991 ski natique.. ground/relay or fuel hydrolock?

    Hey there,

    Also posted to CC forum but not as much interaction it seems like there.. so some goes here I’m a long time user of the forum,Thank you all in advance for your help, and for the years and years of learning about my machine you all have provided.

    Ok, so. Here is the break down: boat is a 1991 ski Nautique 351w. Brand new engine as of 5 hours. New SKIDIM protect conversion kit, new fuel pump, new battery, new starter.

    The second time out with the boat with the new distributor in, the boat ran better than it ever has, was beaming from ear to ear, even at break in RPMs. Anyway I’m about 6 miles from my cabin, the wind picks up, I head back home with family. The engine begins to get very sluggish, I keep on the throttle as I’m thinking it’s a distributor issue, as I had been tweaking it to get it dialed - I assumed it was that. So kept going, by the time I’m at the dock, the engine is seriously sputtering, and had died a few times with a VERY hard start.

    I open it up, start it up, and see it’s been flooding out of the J tube massively. I pulled the plugs let it air out. During this time I’m also finding it really has a hard time starting. Obviously.

    Week later, new carb rebuild. I turn the engine but it won’t turn over “well” feels like a lot of pressure, or that the battery is dead, and indeed the battery is being pulled very hard and the ground wire at the battery is very hot.. I then go ahead and buy a new starter, as I assume that the solenoid is working as it’s giving power to the starter.. new starter in, but now cranks the engine over a few times ( with a new fully charged battery only) but engine wont start up as it only gets a few revolutions before it feels like the battery is dead, it pulls from 12V down to 10 very quickly on the gage. So, I check the power coming from the relay to the starter ( it’s a one wire configuration) and when I turn the key, the starter is only getting 6.5V max.. the other thing that is happening is that the relay output is showing 12.3V from the output ( to starter) when checking the volt reader touching the engine as ground…. So.. with all this back story. And being that I’m on a northen BC lake and all parts from the USA take weeks and cost a lot to ship - what do my symptoms tell a trained ear/eye?

    Another important note is the the engine cranks over fine with no spark plugs, manually it cranks fine, and same with running the starter, when plugs are in, it manually cranks with some force, I’d say 60lbs of force or so.

    Anyways, log back story, but I’m really hoping I did not destroy my new engine. Anything I should test? Could it be the solenoid “welded” as I’ve heard can happen.

    here is a video of the issue : https://youtube.com/shorts/zsmdVs_9w...0kmqhocQB4-ZuO

    Thanks again.​
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