That's actually useFUL and not really trivial...haha...what I was trying to say but you said it much more eloquently.
Other useful info for the OP...how is your pump oriented? inlet/outlet ports horizontal or vertical? I mounted my pump on my brew cart the way that someone here told me. I think it was @mullerbrau but not sure... He said to mount it so that flow is vertical and the outlet points up. That way it's easier for the air to escape and the pump will prime better.
Lately I've been thinking of switching it. I feel like I get an airlock between the pump and the kettle sometimes. The ball valve on the kettle is about 10 inches higher than the pump...about a foot above the invlet since it points down so when I open the ball valve the liquid should flow but sometimes even with the extra bleeder valve on the outlet side of the pump open I can't seem to get liquid flowing. I have to remove the line from the inlet and let the liquid flow then hook it back up. Of course exposing myself to the opportunity for very hot liquid to splash on my hands...
The ball valve with the black handle is flow control. The blue one is a bleeder valve to allow air to escape and improve priming.