Water Pump Quit Suddenly

Before you go whacking the pump with anything. . .

Remove the pump.
The pump, from the factory, has push-on electrical connectors.
Sometimes the electrical connector's metal degrades over time, either from micro arcing or dissimilar metals.

Inspect the pump push-on electrical connectors - both sides, female and male terminals.

If you see any blackened areas on the connectors you will have found the problem.

APRSRVer wrote:
...and sometimes that will jar it into submission

Yeah, or break the magnets:)

For the time being, try whacking it with a hard object like a hammer. It's a PM (permanent magnet) motor and sometimes that will jar it into submission.

Are you sure there is no sound. If it is still getting power it might just need to be primed. This happened to me. Somehow the water pump became unprimed and I had to gravity prime it. This happened to me two months in a row.

Check that you not only have power but you have a ground path. A 12V test light is all it takes to do that. Check the power wire at the pump for a hot while referenced to a known ground, and if you have power there, then check for power referenced to the pump's ground. An open ground can certainly be the issue.

If the power and ground check out, check for continuity through the pump using a multimeter.

It's entirely possible that it simply gave up the ghost. I wouldn't be surprised, and wouldn't hesitate to replace it. The basic model ShurFlo pump is not expensive...

Use a volt meter or diagnostic volt meter to see that there is power at the pump. Then try to reverse the wires powering the pump (swap - with +) and see if that makes it run. Sometimes a foreign object lodges in the pumps impeller/diaphram. If that all fails...shop for a new one. Good luck. In my 25 yers of RVing and several new RV's...I've never had a pump fail...and only had to get and install a rebuild pump kit from Shur-Flo once.