help with 1s not pumping

[RichardB]

I bought a 2nd hand 1s. Ive plumbed it all in however the pump isnt pumping. Ive removed one of the connectors from the pressure switch and the pump make a loud vibrating noise. But no water comes out. I have attached the hose to my washer bottle and I have sucked the water throught as far as the pump.

Could it be having a problem pulling it through the washer bottle pump?