Puzzling question- water pump leak

[Travln2]

2019 Jayco 5th wheel, 28.5RSTS
Found a small crack in our water pump, putting out a fine mist of water. We don't have one of those complicated water panels, just a city/tank diverter valve, and additional winterizing valves behind a wall.
I ordered a new pump, still waiting for it, and was happy to find a valve next to the pump that I could shut off, and stop the leak, while still using city water pressure.
That was yesterday. This morning our fresh water tank was overflowing with a slow, steady drip.
I think the water can only get into the tank through the City/tank valve or backwards through the water pump.
I had previously put a check valve on the pump for the same issue.

I'm thinking that my city/tank valve must be leaking as well, sending water to the tank. Does that make sense? Maybe the valve near the pump that I turned is sending water to the tank? If it is, it's just a trickle.

It's coming up on 6 years old, so I went ahead and ordered that diverter valve as well.

 

[Travln2]

Puzzle solved. I replaced the water pump today, and put the valves back into normal operating position. Turned on the water pressure at the pedestal, and no water went to the fresh tank. Success.
Then just to see what would happen, I turned the valve that bypasses the pump.
Now water trickled into the fresh tank again.
I'm convinced that the Tank fill/city water valve is the culprit and has been for a few years. It just wasn't a problem when in normal mode with the water pump check valve functioning properly.

I'll put the new valve in at the next stop. We're not leaking anything at the moment.