Not totally sure, I had a problem with my starboard pump filling today. I just switched to the yellow impellers. I finally got it to prime while filling all three tanks at the same time. Not sure if it will help, but give it a try. Play around with it a bit, fill, empty, fill, fill, etc.......Good luck.......you should be fine once you get it to prime once. Coming out of winterizationd the lines should be pretty much bone dry......
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