Open tho access port on top of tank, fish out the pump. Look at bottom of pump, the intake. You will see a little tab that is the centre of the pump impeller. Give the tab a twist , do it with tap switch on.
See if that starts up the pump. I have found that as the pumps get old they can " hang up" and not spin.

Alistair 

> On May 1, 2016, at 5:49 PM, Marc Perdue <mcperdue@GMAIL.COM> wrote:
> 
> Hi all,
> 
> My potable water pump is not working. I replaced the faucet with a
> Shurflo, not necessarily because the original faucet was bad, but
> because I wanted to. Having city water is not a consideration for me;
> I've never hooked up to city water and don't intend to. I also like
> the fact that the Shurflo is variably adjustable and that the faucet
> itself is adjustable up and down.
> 
> After installing it, I made sure there was enough water in the tank
> that the pump should work. There has to be .5 to .8 gallons or the
> pump won't turn on. I had enough water in it that the yellow light
> came on on my display, roughly between a third and half a tank. I
> checked the voltage at the blue and brown wires coming from the pump
> itself and got 0 VDC with the faucet off. With the faucet on, the
> voltage was 12 VDC (or maybe -12 VDC). This seems to indicate to me
> that the faucet switch is working correctly and that voltage is
> getting to the pump when the faucet is turned on. It also seems to
> indicate that the pump itself is bad. Am I interpreting my results
> correctly?
> 
> Thanks,
> Marc Perdue