I can't get the picture to post at a reasonable size so I'll just ask the question. I'm looking at our fresh water, water pump with the motor in the rear. There is a thumb tightened line coming into...
Did you find a clear plastic line that is about 3-feet long and does not connect to anything?
This google search pictorial is the idea of how it is suppose to work
MY pink anti-freeze line is laying on the floor between the RV water pump and the hot water heater unit. I just turn the valve and pull the stopper end of this 3-foot clear plastic line and stick it down the pink anti-freeze bottle - then turn on the water pump...