Water pump turns on when tap not in use

[ParachuteMan]

Tried the search option but nothing appearing. I’ve had my Oct 23 Ocean out 5-6 times and had no water pump issues. Out in it this week and used the shower to wash the dog, no problems. This morning, I was woken by the water pump motor. I went to check, lifted the shower inlet cover and the pump stopped. But it wasn't the shower pump. Came back from a walk this afternoon to hear the pump going. Opened the back, flicked the shower pump on and off and the water pump stopped.

When I arrived at the site I over filled the water tank and when I ran the tape, there was a leak from the back along the floor. I drained the water tank a bit and the leakage stopped.

Are these connected and any ideas of what is causing the water pump to switch on by itself ?