This is the drivers side rear compartment. Left pump feeds the ski locker and front sacs. I used the Simer pump BW8512 like many others recommended.
Overflow and vent line thru-hulls
I routed the fill/drain line with the wires up in the top of the compartment wall to keep them hidden
from the engine compartment looking into the passanger side rear storage.
Rear bag pump, duct tape is temporary fix until I buy a new impeller housing as it was cracked during shipping
Vent line (left) Drain line (right)
I used bags that I already had so they don't really match. This holds 680 lbs, usually fill to about 550 lbs to match the drivers side bag
Ski locker sac, bought on wakeside.com for $75 and it fits perfect! I ran 2 overflow lines from this bag to two side sacs under the front seats. once it's full it overflows and starts filling the front bags. so far it's been working great!
looking from in the ski locker to the back of the boat
looking to the front, the overflow lines that fill/drain the front bags
the front passenger side side sac (max 250 lbs, fills to about 150 lbs).
looking toward the front of the boat
had to drill a hole for the fill/drain hose to come up
There are a couple problems with this system. These bags can fill up with air and not vent because the vent is in the back and below the water line. If you get the air out before they're full, then they will fill all the way. Also, it takes a lot to get these to overflow out the vent line, it will push the seats up first, but it will overflow out the side. I usually watch them to make sure they don't over fill.
Here's the switches. I bought them with a wiring kit from the MC dealer. I was told it would be around $100, but it actually came out to $220. It was nice to have all the switches wired correctly though, just had to plug the pumps in and connect the power from the switches. I left the front open for a possible 4th pump for the front bags if the overflow system doesn't work well
I didn't use quick connect fittings, so this is my method for letting the rear compartments dry out.