bilge water after the pump stops

I have been doing some spring cleaning of my 418, and this year in the Pacific Northwest we grew a lot green gunk over the winter. A few weeks later I came back and found water under the sink, in the wine rack compartment, and around the toilet water sea cock. I vacuumed it all up, wondering if I had a leak, or if it was from cleaning, or all the incessant rain. I checked a few days later, everything still dry. Two weeks later, water was back under the sink and wine rack. Now I started to worry more about a leak. I vacuumed up the water, and by chance decided to put the vacuum up to the drain hole of the wine rack compartment.  Lots of water came through. So then I took up the center floor board, and sure enough, lots of water in the open well. Then I looked in the hole in the hump between the open well and  keel plate well, and saw water in there two. So I bought a manual 1/2 liter extractor pump and pulled out at least 6 more liters from that location. Anyone know just how many liters of water remain in the bilge after the bilge pump runs dry and shuts off?  By my estimate so far, 10 liters, that I know off. Also any other places I should check?  The good news is I don’t think I have a leak, and all of the times I found subsequent water was likely water in another location making its way to a visible location as the boat rocked in the storm waves. 

Edited by Vdragon - 23 March 2025 at 03:38

Thank you for the reply.  I hadn't needed one up til now, but that is a great suggestion.  Thanks

Thank you for the link!