Originally Posted by brewingmeister
sounds like the pump is not primed. you have air and liquid in the head and not just liquid.
Very well could be the case. Tell me where I am going wrong in the following scenario.
1 - liquid comes into pump head via gravity by opening ball valve on kettle.
2 - wait for liquid to stabilize then turn pump on
3 - either the pump would run as it should or I would get an initial outburst of liquid into to kettle then nothing else.