A pump was going tapockety-tapockety in the corner.

Then when that gets too full, a pump goes on, and pumps all the water outside.

This will have quite an effect when the pump goes on.

The pump went on and there was a slight thud as it clamped on.

Patricia let the pump go until it was laboring, then shut it down.

I suspected the pump was going so I put a spare in the boot.

The other pump is sealed-off and goes into desorption.

After the activity is complete, the pump goes back on.

The jerks who sold and installed that pump are going to hear about this!

Many writers use "triggers" to get themselves primed to write when the pump has gone dry.