Chuck_S wrote:
Remove the little screen and push the button hidden underneath a few times to free it's motion. Should cure the check valve problem. If not it's replaceable.
I've given up on the little rubber cover and have a solid, screw in plug on our fresh water inlet. Solves both problems.
Putting antifreeze in the fresh water tank is a poor procedure. For starters this tank is never completely empty so you're pumping diluted antifreeze into the system and this "tasteless" antifreeze ain't tasteless. Your water will taste "pink" all next season.
-- Chuck
What he said. These things are cheap, if it were mine I would just replace it. I picked up clear tubing from the hardware store and dis connect the inlet side of the pump, hook the tubing to it and pump straight from the bottle. Quick and easy.