[party of 5]

When I was out dry camping I turned the switch on for the water pump and it sounded as if the pump was running. It was a vary faint humming sound. It would not stop. I checked the toilet, sinks shower/tub and outside shower to see if any were on, all were off. I turned the switch off and the noise stopped. I turned the swith on again and same thing happenend. The pump will not stop making this noise when the switch is on. I thought maybe even low voltage in battery but that was not the case either. The last thing I can thinkof is possibly a small hole in the diaphram. Any suggestions or ideas would be great.