The pump is NOT self priming. You must remove ALL air bubbles. Gonna need a plastic tee (and a valve) on the inlet of the pump to start the siphon. Open plastic valve on tee and suck to start siphon then close valve. Put a valve with a bleeder port on the outlet of the pump and purge air when siphon established.
Mead Lane Brewing
The liver is evil and must be punished