JGP - did you get your drain pumps priming and working consistently yet? I had similar issues with hit-and-miss performance. The angle of the outlet on the drain pump plays a big part in it not airlocking and allowing it to prime correctly.
Pretty solid now - say 90% of the time. I first had them installed like this below. Basically the opposite of how you want them so taking the advice of Wakemakers I rolled them 180 so the pump outlet is on top and they work good now.
My only challenge in getting them to work 100% of the time is that the bags are too big for my compartments (still haven't ordered the custom ones yet) and they will bunch up and cause problems on occasion.
No not consistently. Right now the fool proof way to drain is fill them all the way up until it flows out the vent and flip it on. I plan to change the angles of the drain pumps this weekend and see how that goes. Did you keep the 90 degree elbow on the drain pump outlet when you turned it upward? Also, do you think pump proximity to the bag has anything to do with it? We were thinking of putting the drain pumps right next to the bag.
Yes - kept the 90 fitting on it. On my fill pumps I am using straight fittings to save space. Just having that outlet on the top so the air gets pushed out is the trick. I have been told having the pump the closer the to bag the better. In my setup I have a few inches of hose in there and it works for me.
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Here are some pictures of the two pumps we added. The thru holes are on either side of the paddle wheel and the one closest to the bow is beside the depth finder (I think that's what that is).
I moved the drain pumps in the rear so that the outlet of the pump is facing upwards. Haven't had a chance to test it on the water yet unfortunately.
When installing new intake thru-hulls, do you need to smooth (i.e. sand) the inside of the hull where the nut will make contact? The inside of the bilge has a black somewhat rough coating on it.
We did not do any sanding. Just made sure to use plenty of sealant and made sure they were tight. Have it on the water 3-4 weekends now with no problems.