[cammy]

Okay, I took off the long hose and attached a 25cm 6mm line from the pump back up to the tank. Unfortunately it has not made a difference. The pump just doesn't want to seem to turn on. I checked power to the pump with the multimeter and it is fine. I have even tried to manually suck air out of the pump head through the line with a little bike pump that has a reverse setting. The water pumps through fine so I think the problem is elsewhere.

I have disconnected the water level sensor but no matter what I try I keep getting the water level light coming on instead of the system actually priming.