Hi SER,
Here are your pictures.
Picture #1 shows the location of the bilge pumps.
Picture #2 shows the 1500 Rule pump down in the keel sump. When I bought the boat about 1 1/2 years ago this is how the pump was. It wedges in by its size, which limits how far it can go down in the keel sump. Its float switch is mounted on the fiberglass keel to surface. Note there is two float switche, the 1500 float switch is the darker of the two. It is towards the top of the picture.
The Rule 2000 I added, is mounted on a wood block about 1/2 inch thick, as is its float switch. This makes the trip point (turn on) higher than the smaller pump. Its discharge hose actually touches the top of the smaller pump. The wood block is secured to the keel top by SS screws and the pump is screwed to the block.
Pitcture #3 shows the wood better (white arrow). To remove the smaller pump in the sump you have to take the top pump off its mounting plate by the red buttens on either side of it (black arrow). Then the 1500 pump lifts out for cleaning or what ever.
Piture # 4 shows the discharge hoses under the galley sink. The white arrow labled #1 is for the 1500 (lower pump) and you will note it has a check valve in the line. White arrow #2 is the Rule 2000 line and it has no check valve. If it comes on we mean business and we want no restrictions in the line. Both hoses go to seperate SS through-hulls in the stern. the through-hulls are well above the water line and the hoses rise to prevent water from comming in on a following sea.
Hope this helps and if I can give you more information just let me know. Remember there are lots of ways to set up bilge pumps and I also know some E27 go with none.