Try this:
Disconnect city water and open a sink faucet to relieve system pressure.
Turn on the water pump and let it run to shutoff; turn it off; bleed down pressure.
Repeat 3 times (no more - you don't want to overheat the pump).
Reattach city water and re-pressurize.
Hopefully whatever crud is stuck in the valve will be blown out.
Prevention is the cure here.
NEVER drain the hot water heater through the low point drains.
Always close the isolation valves and drain it through the water heater drain.
Bits of calcium and anode can become trapped in the pipes and be pushed into places you don't want (like faucet screens and valves - toilet and water pump) when city water pressure is added.
Dirt in fresh water (campground well water) can also do this.
They also make repair kits for the pump if you are handy.
Not sure what model you have but here is the kit for the Shurflo 2800 -
https://www.solar-electric.com/94-23...FdaCswodgPME8Q