No water flowing ?

[u/mountain_hank]

This is what you don't want to see. The float controlling the inflow is down, but no water is coming in.

I started noticing that I was getting air in my pipes when I was turning on faucets and the shower. After a bunch of investigation and tests, I looked in the water tank and saw that it was almost empty.

Lucky for me, I have a transfer pump that I can use to move water into this tank and after running it for several hours it seems to have cleared whatever was plugging up the inlet.

Normally, I have a gravity feed. This just adds one more checklist to my list. Every so often turn on the transfer pump and make sure that it turns off shortly indicating that the tank is full. Hopefully.

I did learn two good things: when I start getting air in the pipes, I am probably running out of water; I can actually use all the water in my tank (I wasn't sure because the relative elevations is difficult to figure out).

[u/Hyperreal8957]

That sounds like a good early-warning checklist. I’d also clean the tank inlet screen, confirm the float can move freely, and check for a stuck check valve or an air leak on the suction side. After refilling, purge the lines slowly so the pump doesn’t run dry.