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Old 05-25-2011, 08:59 PM   #1
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Noobie black water question

So today I decided to flush the black water with the hose fitting. First thing I found out I needed was a female/female connection, which I obtained. I then hooked up the garden hose and turned the black water faucet and all it did was blow water every where. I thought the back-flow valve was stuck so I took off the connection and fiddled with the plastic valve sticking out. I then reconnected and tried it again with the same results. While it was spraying water all over, I went inside the trailer to hear if it any of the water was getting into the black water tank, but it wasn't. So, I turned off the water, disconnected the hose and went to the dump station and dumped. I am wondering if the black water dump valve must be open in order for the internal flush to work. If that's the case, it's a dumb setup. If not, then my back-flush valve isn't working right. Any suggestions?

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Old 05-25-2011, 09:13 PM   #2
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Are you hooking up to the black tank flush connection?
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Old 05-25-2011, 09:19 PM   #3
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Originally Posted by pappy19 View Post
...>snip<.... I needed was a female/female connection, which I obtained. ...>snip<.... I am wondering if the black water dump valve must be open in order for the internal flush to work. ....>snip<...

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First, the need for a female-to-female fitting seems odd....ours has a female fitting on the trailer to accept the male end of the garden hose.

Second, the black water drain valve noes NOT have to be open for the flusher to spray (at least not in ours)...but you do need to monitor how full the black tank is getting, however, and release it in time so your toilet does not overflow...

The flush intake is somewhat notorious for failing. It sounds like your problem is in that fitting...

It's not a solution, but hope this helps narrow the field...
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Old 05-25-2011, 09:28 PM   #4
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Some Classic trailers had an exterior faucet with a back flow preventer that you could hook on a short hose to the black tank flush.That could be the valve???
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Old 05-25-2011, 09:44 PM   #5
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I will take some pictures next week as I have parked the AS for a while. The fitting I was using is the only one with a turn wheel and has a male end. It also has a fitting with over-flow holes and an internal plastic valve thingy. I understood that was specific to the black water tank flush. I guess I needed to refer to the manual before "assuming" anything, so bad on me.

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Old 05-25-2011, 09:45 PM   #6
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Old 05-25-2011, 09:49 PM   #7
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Our 2011 International says specifically that the black tank valve must be open when using the flush facility; there's a sticker to say so! It makes sense because you're introducing some pressure to the system and if it can't find release through the main dumping valve then it'll find somewhere else, such as the toilet!
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Old 05-25-2011, 10:27 PM   #8
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I expect that you are right. For me at the time, it wasn't an option so I tried. Now that I think of it when I opend the white cover there was more than the normal drip of liquid. I assumed that the fitting went directly to the multi-spray valves inside the tank so it wouldn't make a difference as long as one watched the tank level. BTW I just ordered the Noobie Book from AS, so I am sure it will be obvious. Many thanks for the responses, I appreciate it.

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Old 05-25-2011, 10:49 PM   #9
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Our 2011 International says specifically that the black tank valve must be open when using the flush facility; there's a sticker to say so! It makes sense because you're introducing some pressure to the system and if it can't find release through the main dumping valve then it'll find somewhere else, such as the toilet!
Yes, the label says to leave the tank drain open, but that's just to avoid the toilet overflowing. Any excess "pressure" would be released through the black tank venting system. The point is that the black tank sprayer does spray, even with the drain valve closed...
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Old 05-25-2011, 10:52 PM   #10
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Quote:
Originally Posted by pappy19
I will take some pictures next week as I have parked the AS for a while. The fitting I was using is the only one with a turn wheel and has a male end. It also has a fitting with over-flow holes and an internal plastic valve thingy. I understood that was specific to the black water tank flush. I guess I needed to refer to the manual before "assuming" anything, so bad on me.

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What you're describing is exactly what is on my 2008 Classic. It is simply an exterior water faucet with a back flow preventer. If you're connected to city water or have your pump on, fresh water will be available from this faucet. You can use this to wash your hands after dumping your tanks. If you have the black water flush kit installed, you can connect a standard hose between the faucet and the flush inlet port. There is an air-gap back flow preventer between the inlet port and the BW tank sprayer. This should be a safe process but many understandably have reservations about flushing the BW tank with water from the freshwater tank. One has to have faith that both back flow preventers are doing their job.

Note: This faucet is beyond the heated area of the trailer. On the Classic (and other similarly equipped trailers) there is a shut off valve under the closet that allows the exterior faucet to be drained in freezing weather while the rest of the water system can be used in a heated trailer.
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