search his other posts, but I'm sure he has 3 pumps and 2 of the Y valves running his system. I can't remember if he told me that they were mounted in the '09+ model year factory location in the port locker of his may be in the engine compartment, along the back wall.
For the rear v drive lockers and the 2 bags under the rear seats i have 2 reversables and 2 y valves for filling and this is also used as a drain.
IBS is filled off the stock areator pump, and i use 3 Tsunami 700s to drain the front, 1 is the factory ski locker pump to drain that one. Then on the IBS i have a Tsunami on the bottom of each leg to drain it. I run all three pumps daisy chained together, used a 10amp fuse and it works fine.
As for the location of the 2 reversables i have them mounted above the muffler on the rear wall. I mounted my Y valves on the panel above the V drive and you just pull the seat out a few inches to access both valves
I had the giv sprinkler valves and a drain pump on each leg.
Why did my box and the fat sac website say725lbs for the IBS?
I assume but not positive it can be filled to that amount, depends on the brand of the bag, and what boat its really designed for. I had a MC bag in my nose for a while, then Spencer finally got a Moomba bag in.
And you sir I have not forgotten I will get you a board list of recommended boards. The one you were riding is the Inland Surfer Red Rocket