OK folks, if your pump is "cycling" every little bit, whether it is 1, 3, or 30 minutes, your pump check valve(s) are allowing water to pass from the high pressure side to the low pressure (water tank) side.
Debris can sometimes get by the filter screen, or can even find its way into the lines on a new RV during assembly and eventually into the pump workings.
RV water pumps are usually similar in design and as long as you take your time during disassembly not difficult to clean and reassemble. Actually getting the pump out of whatever cubbyhole it is installed in can be a whole 'nother matter. Below is an exploded view of a typical Shurflo pump. If you work over a clean cloth you will probably find some small, even salt grain size, bit of trash that is not letting one of the check valves seal completely.