Mikebat
Member III
My fresh water pump (ShurFlo, late 80's model) runs continuously if the breaker is on. It seems to have air on the pressure side, but I have bled at least 10 gallons of water through all the taps, and yet the air is still in there. I checked the intake strainer today, and saw that it had a bunch of bubbles bouncing around inside it when the pump was running. Pulled it, cleaned it, and found a crack in the hose barb base. So I replaced it, tried to bleed the system again, and now there are no more bubbles visible inside it, but the pump still runs continuously and air+water is still coming out of the galley cold water tap, and the head cold water tap. Both hot water taps seem free of air. I guess this is because the hot water tank collects any air in the lines, but the cold water taps are connected directly to the pump outlet, with no tank to collect the air.
I can't find any fresh water leaks while the pump is running. There is a very slow drip of water coming off the pump body while it runs (can't quite tell from where), but it's hard to imagine that this is enough flow to cause a pressure drop and keep the pump running. It might be enough to introduce air, however. I wonder if I need to pull the pump and replace the diaphragms? Or maybe it's the pressure switch that's busted? Any other ideas?
I can't find any fresh water leaks while the pump is running. There is a very slow drip of water coming off the pump body while it runs (can't quite tell from where), but it's hard to imagine that this is enough flow to cause a pressure drop and keep the pump running. It might be enough to introduce air, however. I wonder if I need to pull the pump and replace the diaphragms? Or maybe it's the pressure switch that's busted? Any other ideas?