Originally Posted by Chrissyking
Now the impeller has just snapped on new pump ...getting really angry now !!!!!
I'm guessing a blocked tank vent is the source of your woes, most likely the vent thru-hull. When the tank is out, the vent fitting on the tank is open, providing the necessary source of air to prevent your macerator pump from pulling a vacuum that won't allow anything to be pumped out. When you put it back, the pump pulls a vaccuum. The impeller snapped because running dry "fried' it.
Spring is when the mud daubers love to build their mud nests in any opening they can find...or, the vent thru-hull--and maybe the vent LINE too--may just be clogged with waste that's spilled into it when the boat
out the thruu-hull--and maybe the vent line too--should solve your problem.
The good news: at least you're only dealing with water
till you've solved
the problem...not a tankful of waste!