The pump on this unit would not be a self priming pump, so you would need to be close to the water source and make sure you have plenty of pressure so you don't get a decrease of water. I would say make this a gravity feed for the tank and you may have to add a booster pump as well, if you need more pressure, because what can happen is when the tank starts to go down on water, you willl start to lose flow.
Thanks,
Pressure Washers Direct