Rear Sani-Flush - Dutchmen Owners

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Old 10-15-2013, 12:50 AM   #1
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Smile Rear Sani-Flush

Was hooked up at home, still checking things over and went to flush rear black/gray all in one tank, noticed hose had no flow, turned water off and had to slowly disconnect, water was going no where; Now I trace line to under sink and see what must be a check valve, so I swap lines and what do you know the rear tank rinse is working now! At first I was telling the DW will probably have to bring camper to dealer to drop bottom and find crushed line etc. thank goodness for a simple fix.
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Old 10-15-2013, 01:46 AM   #2
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Both of my sani-flush connections seem to have the check valves reversed. Problem is I can't find where they are located. They are not right behind the connections.
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Old 10-15-2013, 02:07 AM   #3
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I wonder if the check valves aren't opened when the dump valve is opened. I had the same problem with the rear flush connection not allowing water to enter the tank. I opened the dump valve because the instructions said not to flush with the dump closed.
That seemed to make the flush system work properly.
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Old 10-15-2013, 02:38 AM   #4
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I've tried it both ways. It will take some water, but very slowly. The hose stays pressurized as if no water is flowing but according to a flow meter I put inline it does take a gallon about every minute. How can that be doing any good if the dump valve is open and it's just dripping water? I had installed a "tornado" in my last camper's black tank and it did a much better job.
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Old 10-15-2013, 02:57 AM   #5
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There's a lot of chatter about the check valve being installed backwards. Not that that is impossible to do but holy moley, someone has been installing these things for a few years. It's not like it's a prototype system and it's in the field testing phase. Also mention of a vacuum breaker/check valve combination. Some say the valve is behind the shower wall but that could be a completely different flavor of rig.
While the sealed bottom is a good idea is sure messes with trouble shooting when it comes to tanks and valves.

Google RV sani-flush and you'll find different problems associated with the system. Just be glad your problem didn't include water spraying all over the inside of your rig due to loose connections.
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Old 10-15-2013, 12:55 PM   #6
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OK, front Sani-Flush works, how can I tell? You can feel the flow through the hose and see water coming out of clear 45 degree connection, I too at first camp out thought rear sani-flush was working until I got home and hook up and have time just to let the systems flush, I found rear hose hard and no flow, traced to under rear bathroom sink and inlet hose from connection was hard as a rock with outlet from h check valve soft...turned off water and depressured outside and turned h check valve. Swapped inlet and outlet of h shaped check valve/siphon breaker and voila we have sani-flush to rear tank, just think of an h the inlet goes to the bottom left of the h and the outlet comes from the bottom of the upside n right side of h. PM me if not sure. Will try paint program and draw up something.....
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Old 10-15-2013, 02:01 PM   #7
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Imac=No paint program

Had to do this illustration in PDF format, hope it helps
Attached Files
File Type: pdf Anti-Syphon pic.pdf (200.8 KB, 129 views)
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Old 10-20-2013, 03:28 AM   #8
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I found that my rear San-T-Flush would not work back in July when I brought it. I took it to the dealer twice. The last time they told me they would have get a diagram from the factory to work on it. That was after they kept my Voltage all week. The first of October I was trying to figure out how I could take it to another dealer for repair. I decided I'd work on it myself. I found the check value under the rear sink was reversed. I had to carry a water hose with a wan into the RV for over 2 months because of this common error that I traced back several years. You would think after all these years they could install the thing right the first time.

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