2019 GS22 belly ballast not sending water out vent

[KAUS]

Hi all, new to me 300hr 2019 GS. The belly ballast isn’t filling to the point of spitting water out of the vent hole. The port and starboard rear ballast both do. I can hear the pump running, although it sounds a little less powerful than the rear ballasts. I’ve tried the burp technique of running to 100% and then hitting drain for a bit then running the pump again. Can’t get water to come out. So I am not sure how full the bag is getting. Ideas and thoughts? Is there an easy access point to visually check the belly ballast and feel if full? Thank you in advance.

[NautiqueJeff]

The ballast pump impeller is probably bad on that pump. I'd start there.

[KAUS]

Thank you. Will do. Where on the boat can I access a portion of the belly bag to visually check if filling all the way?

[Coreyp]

I am actually having a very similar issue. I have a 2019 GS22 that I have owned since new. Noticed this year my ballast was slowing down/port pump struggled priming a time or two. Replaced all the impellers and know my belly bag is filling slow (port and starboard working great). All of the bags pretty much filled in about the same amount time before. Now the belly tank fills to 100% per the screen and shuts off (port and starboard show 100% and are truly full), then I have to hit fill again and finally see water coming out the vent about 2 mins later. Exact same thing happens when I empty. Thinking I either have some blockage or the pump is just not running as well - definitely does not sound as strong as the other pumps.