I run the pumps on my Makai until water comes out of the overflow too, but still had lots of trapped air in them. Here is a video of how much air.
https://youtu.be/JvPQ9EbPzy0
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2021 Moomba Makai
Black Cherry Metal Flake & Fire Red
Nibral OJ 15.5x15 Altitude/Wake prop w/1.76 trans v-drive
Wet Sounds bow speakers & 10's on the Tower & ported sub