Jim,

I probably have the same setup, the macerator is mounted on top of the holding tank. Mine will not pump, it runs fine, but it won't pickup any of the liquid. I talked to Liberty and we both come to the conclusion that the rubber impellers are probably gone and that's why it won't self prime. I have a dedicated 1/2 garden hose and while at Camp Keller, Roger, Jim and I tried back flushing to get the pump to prime, but no good.

I have the bay opened up while replacing my tank sensors and to get to the macerator is going to be a nightmare. All the plumbing has to be removed in order to reach the pump. I'll tackle it later when the temps are warmer.

Like Pauls, mine has a momentary switch on the dash. I would rather have the switch back in the plumbing bay and when I take it all apart, I'll add a switch so the macerator can be used from the bay.

If yours won't self prime, you may have the same problem or the king left you a lodged log!