Vacuflush system won't hold pressure

[Nater Potater]

Oh, and troubleshoot why the macerator pump runs but will not pump out. I was curious if it worked since i never used it before. Flushed with water till 1/2 tank and then found out it doesn't pump out. So now here I am 1/2 full and the pump out station is still winterized. Brilliant move on my part.

I had a similar issue with my '92. Is your macerator the plunger style? If so, it has duckbills just like your vacuflush pump. If it's run against a closed 3-way or capped flush port, there's a good chance the duckbill(s) got inverted. You can see the fun-time here.