My boat has a big leak somewhere. I checked the hull, no dents or cracks ins in any of the welds. I thought the leak was from the livewell being repaired wrong, but that didn't work. I put the boat in and when I take it out there's gallons of water coming out each time. I don't think there is a bilge pump in the boat.

First thing I'd check was ensure that the boat plug is actually "plugging".

A-Ja

 

What kind of boat is it?  You said the live well was recently repaired.  Get a garden hose and fill the live well to make sure no leaks.  If that's OK, take your jack and raise the front of the boat to it's max.  Get a garden hose and put some water in the back of the boat.  Look for where the water comes out. 

My vote is on bad plug. I replace mine yearly. I see alot of people over tighten them which seems to compromise their ability to stay sealed 

4 hours ago, Bolar said:

What kind of boat is it?  You said the live well was recently repaired.  Get a garden hose and fill the live well to make sure no leaks.  If that's OK, take your jack and raise the front of the boat to it's max.  Get a garden hose and put some water in the back of the boat.  Look for where the water comes out. 

exactly what I did, only I opened the plug while the boat was on the trailer but in the water. Turns out its a tiny stress crack, getting I repaired soon.

Yup I'd fill the boat up with water and see if you can find the leak.  I had an old aluminum which had the same issue.  What was interesting is that it depended on how much I ran the big motor would drive how much water I would get in the boat.  If I ran the trolling motor it would be relatively dry...I think it was the vibration/bouncing around would cause more water to leak in.  Once I found it and sealed it, it was dry.

28 minutes ago, Quarry Man said:

exactly what I did, only I opened the plug while the boat was on the trailer but in the water. Turns out its a tiny stress crack, getting I repaired soon.

Glad you found the issue