It sounds like a hole in the pump bellows.
Or the the bellows and entire pump housing are are also so encrusted with waste and TP that flushes can't get out through the the hoses. That flushes are getting out through through the "seam" connecting the top of the pump to the bottom of it is also a good indication that the gasket
'em is also shot.
Using too little flush water
is the most common cause of 90% of problems with VacuFlush toilets. People interpret "can use as little as 1 pint" to mean that's all it needs, when it actually needs about as much as most macerating electric
toilets to prevent buildup and clogs. When enough water
to keep it rinsed out it is used, very few spares are ever needed. So follow jkleins' advice to clean out the pump and replace the duckbills. If that doesn't solve the problem called Dometic for the name and location of the nearest "authorized service
center" (the only source of VF parts
except for duckbill valves) and buy the kit.
I've written a piece I call "VacuFlush 101" that explains how the VacuFlush works (a surprising number of owners think they do, but don't) and how much water
it actually needs to keep it working trouble-free. I'll be glad to send it to you--and anyone else who wants it--if if you'll send me an EMAIL
(not a PM, no way to attach anything to a PM...just click on my name at the left of this post and choose email
instead of PM). If the system won't let a brand member
.html" target="_blank">new-IRJDSUNE9932123321222xxeww-member send an email
send me a PM and I'll reply with my email
And btw...welcome aboard!