Water accumulating in bilge

[MPKehoe09]

Hi All,

I have a 1998 175 Osprey that I've purchased a couple months ago.
I trailer the boat so it doesn't spend any more than 6-8 hours in the water at a time.

However, every time I pull the boat out of the water, and while still on the inclined ramp, I unscrew my bilge plug, and a fair amount of water drains, but never enough to engage my bilge float switch while I'm on the water.

There are a number of factory installed through-hull fittings for live wells, and some patched screw holes from old transducers, swim platforms, etc.
I assume one of these fittings has a slight leak thats resulting in the accumulating bilge water.

Rather then re-sealing each and every fitting/patched screw hole, is there anywhere in particular I should focus my attention on first? Any common culprits on the 175 Osprey?
One day I hope to keep the boat in the water (seasonally), so this is an issue I would need to remediate at some point.

Thanks!

[BMAC1988]

Does the back of the boat hold water while at rest? Mine does and the big pie-plate access Hatch leaks.  I put tape over my suppers and put water in the boat with a hose while the drain plug was out to find this,  on the trailer of course. 

[MPKehoe09]

I have not been using the internal fuel tank (until I replace fuel lines) so I've been using a portable tank right up against the transom. Because of the added weight aft, I have plugs in my scuppers, to prevent water from coming into the boat. I don't get enough water over my transom, or sea-spray to amount to any substantial water on the deck, let alone in the bilge.

Thinking it has to be a leak at one of the through-hulls or patched screw holes.

[Blue Agave]

Check all baitwell hoses and clamps also.

[CTsalt12]

One more thought: check the front deck hatch all the way up in the bow on the casting platform, below anchor hatch.  On my '89 it drains all the way to the bilge, and I suspect it does for you too.  Not sure how much water would come there when underway though...