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Leaking aluminum boat--potential source of leak

Posted on 5/6/26 at 11:27 am
Posted by Nannyslayer
Member since Jan 2019
154 posts
Posted on 5/6/26 at 11:27 am
Long story short my center console boat leaks significantly when moving. We have filled the boat up with water and it appears to be water tight. The guy I bought it from said that it leaked a little at the jack plate. However, when running the waterline is way below where the jack plate is bolted on.

My mechanic seems to think that my live well lines are cracked and that is the source of the water getting into the boat.

Has anyone ever encountered this? It makes a ton of sense but at the same time I feel stupid to think that just plugging both live well lines would fix the issue.
Posted by sloopy
Member since Aug 2009
6907 posts
Posted on 5/6/26 at 11:41 am to
What kind of boat? I plug both my livewell lines because the fitting is cracked/loose on the backside of one and I’d have to rip the gas tank out to access it.

Have you filled your livewell with the plugs in the transom to see if it leaks? That is how I found mine.
Posted by CP3
Baton Rouge
Member since Sep 2009
7569 posts
Posted on 5/6/26 at 11:59 am to
It does sound like it is probably something with live wells.

Only other thing would be speedo gauge/tubing if you have an analog gauge that is tubed to the pitot on outboard.
Posted by Nannyslayer
Member since Jan 2019
154 posts
Posted on 5/6/26 at 1:36 pm to
It's an Alumacraft. It has had significant welding done to the underside of the hull but they are holding.

Unfortunately, as I was dropping off at the mechanic's he mentioned the theory on the live well. My thought would be to plug the main drain and outflow of live well and then blast water into live well intake. After a few minutes pull main plug and see if water comes out.

And since we only use boat for back water riding (no fishing) I just plug all 3 each time we ride and we are good to go . . . hopefully
Posted by ultralite
Member since Feb 2013
121 posts
Posted on 5/6/26 at 7:51 pm to
Not sure of the exact model so this may not be feasible:

Thoroughly clean out a shop vac and swap the suction hose to the exhaust side. Have someone hold the hose against the drain plug hole on your boat to pressurize it with a high volume of airflow. Use a pump sprayer with soapy water to spray every weld seam.

Odds are if it had been welded on before, it had a crack and sometimes leaks can travel inside a weld for a long ways, or a new crack is only exposed when the boat is under load or with forced air.

Don’t use an air compressor for this. It doesn’t have enough volume (CFM) and it will have too much pressure.
Posted by geauxbrown
Louisiana
Member since Oct 2006
27197 posts
Posted on 5/7/26 at 12:17 am to
Had the same about three months ago. Turned out to be a cracked fitting between the livewell pump and the hose that runs to the livewell.
Posted by Tridentds
Sugar Land
Member since Aug 2011
23888 posts
Posted on 5/7/26 at 3:00 pm to
quote:

My mechanic seems to think that my live well lines are cracked and that is the source of the water getting into the boat.


Fill your live well up and plug the external dump port. Put some green or red food dye in the live well and take it for a run. If you see green or red water in the bottom of the boat you will know if your mechanic is right or not. Very cheap way to check for a pipe leak for the live well..
Posted by bird35
Georgia
Member since Sep 2012
13616 posts
Posted on 5/7/26 at 3:34 pm to
I put some JB weld around the inside and outside of the livewell drain. It stopped the leak in my livewell. I use my livewell go storage though so it filling with water was unplanned.
Posted by Nannyslayer
Member since Jan 2019
154 posts
Posted on 5/8/26 at 8:57 am to
thank yall for all the recommendations! I passed on to my mechanic. Fingers cross it is something this easy/idiotic
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