I'm just throwing out a suggestion or two. When you have water in your on-board tank, and then double check that you do have the water pump switch turned on at the control panel, check a couple of things.
When you turn on the water pump switch, does it light up? This is only part of the circuit for the pump to work. The switch could still be working but the lamp in the switch is burnt out.
Secondly, when you open any of the taps.......kitchen or bathroom, listen carefully. You should hear the pump running as it builds pressure to pump the water. It should also make a sound when you flush the toilet, but it may be harder to hear.