Sounds like you have a problem common to a lot of ballast pumps. You might search here for 'blue globe impellers' or something. I had the same problem with the stock black impellers for my jabsco water puppy pumps. I switched first to yellow impellers which filled and emptied fine but would leak or auto-fill empty ballast tanks when running down the lake because of ... pitot-tube like pressure? Now I've got blue globe impellers which like the yellow, never stick, but unlike the black, aren't completely trustworthy about stopping completely the auto-fill problem. On my boat, the change-out of the belly ballast tank has me removing my kick plate under the helm, tying it aside and out of the way with string so I would not have to bother with disconnecting all the electrical connections to it, laying on my back on the floor of the boat, and removing the hoses and dis-mounting the water pump with my arms directly over my head. The year-later model year of my 211 has all the pumps easily accessible in the engine compartment -- but then, that's not my year. My water pumps are held on by six (6) ss wood screws into a fiberglas covered block (maybe wood block). When re-mounting, I found it helpful to slide five (5) nails in five of the pre-existing mounting holes, and go from there. I find that there are a lot of boasts on this site about how fast and smoothly projects went, to the point of stretching credibility. If I had to do it a third time, I'd give myself two to three hours. I always towed my boat out of my storage and trailered to my home so I could work in daylight. That helped a lot with visibility in dark compartments.
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