This job would have been a lot easier if we had the parts when we original took this J-Series Vacuum Tank apart when we were in Zihuatanejo some time ago. There, we had to repair the tank and we noticed that the Bellows were in need of replacing. But we were in Zihuatanejo and there were no SeaLand VacuFlush parts anywhere around. See this post (VacuFlush J- Series Vacuum Generator failed). We had to order this Bellows from the US and have it shipped to Andrew and Ann on s\v Windsong. They were in Roseville, California on some personal business. They drove them down when they came back to the marina then we had our parts. It took about a month to get new parts and a few days to get the system back up and running.
This job took us about four tries, taking it all apart and putting it all back together and reinstalling it before I got it right. That includes a few calls and sending some pictures to VacuFlush tech support.
It turned out to be me not putting in an O ring. Yes as simple as that!
Four duck bills that got replaced.