The subject:

Where the through-hull is located:

1: Close the through-hull

2: Remove the hoses from the pump.  There will be water.

3. If curiosity so leads you, remove the impeller cover.  6 brass screws.

4: Identify 4 bolts holding the pump to the engine.

5. Do what it takes to remove them.  I had to use a couple different kinds of pliers to get at them all.

6.  It will probably still stick to the engine a little. Give it a little bonk and it should fall off.

7. Bob's your uncle.