Duck Bill Valve replacements - Vacuflush

OK, so I replaced the duck bills but I am still hearing the pump recharging about every 15 minutes. I took them off and put them all back on and made sure I had a good tight seal. Then I checked all the pipes to make sure nothing was leaking (all but one that I couldn't reach).

Is there something else that I should check? The toilet is holding water, so not there either. I think I read somewhere about the diaphragm in the pump. Is this universal to replace too or model specific, and is this even an option? Unfortunately I can't find a model type on the pump. It is either facing the wrong way or it came off (which looks like the case).
 
I tend to doubt that you have a problem with the vacuum pump. I think you might have a small vacuum leak somewhere between the toilet itself, and the pump. The whole line in-between must hold a steady vacuum in-between flushes.

If it only kicks on once every 15 minutes or so, and if it doesn't run for very long when it does, I'd let it go. You can always go the "Night Switch" routine (add a switch to turn it off when you go to bed, so that it doesn't keep you awake at night). VacuFlush sold a lot of those about 10 years ago when they were having problems with their systems.

There's a seal at the base of the toilet that may be leaking just a bit. You can use the shaving cream method - squirt it all around the bottom of the toilet unit (remove the lower shroud first), and see if it gets drawn in anywhere around the bottom of the toilet. If it does, you've found your leak.
 
Hey Vic, the tube seems to run out the back of the base into the wall. Are you talking about the base of the actual toilet connected to the floor or the tube out the back? I assume the tube out the back goes to the canister, then from the canister to the pump, from pump to the holding tank. The tube from the back of the toilet to the bottom of the vacuum canister is the tube that is the most difficult to get to, but I will give the shaving cream thing a try.

Another thing I read was that the vacuum switch on the top of the vacuum tank can go over time. It looks like there is a seal (o-rings) that can go. In fact I saw a kit to replace the seals around the diaphragm on the pump. Could either of these be a culprit? The whole setup seems fairly easy in theory, just a pain to figure out where it is not holding the seal. Also, the pipes are a pain to get to and bend... but I am sure that's everyone's issue...

Is there anything that runs through the base of the toilet down through the floor? From what I can see, looks like the pipes and things come out the sides and into the walls and not through the floor, but without unscrewing the toilet from the floor, I don't think I can find out.
 
I called Dometic today. They ran through the usual checks and got me to the vacumm switch on the vacuum tank. They said there is a test to "jump" the wire connections. She said to take one of the wires off and jump it. Problem is, I am not sure what she means by jumping it. Do I take a wire off and touch the other wire or something else? She went on to say that if the pump went on, then the switch was good, if it didn't go on, then the switch was my issue. Does this make sense? It also says this in the manual I found for it.
 
Just a follow up. I purchased a nice handy tool to measure the vacuum pressure in the toilet system. There are maintenance kits that includes one, but I was able to order it independently. Anyhow, as I went through the entire system, I have narrowed it down to the pump itself being the culprit. I replaced the duck bill's already, so it must be the billow/diaphragm or some component in the pump. So, I am planning on replacing the entire pump as it seems like the newer ones are more dependable and quieter... Anyone know where I can pick one up? I can find parts, but not the entire unit.
 
Thanks Vic. Been through most of them now. Wow, that pump isn't cheap. Lowest I have found is $620. I did find a site that has a build it yourself version for $400. They put all the individual replacement parts together and you assemble them. I may go that route...
 
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