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Old 08-11-2015, 02:19 PM   #11
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Originally Posted by Ham Camper View Post
Last fall I used my black tank clean out connection with my drain valve closed. I waited until the black tank was full watching it in the toile to see how full it was. I then dumped it. I do not see how it is possible for the black water to invade the fresh water lines or system. It seems to me that they are totally separate. But maybe I am wrong on this. Anybody else know about this?
The black water holding tank is totally separate from the fresh water tank as you said. I have heard of people using their water pump to run water into the black tank through the sprayer system which is a no, no and if doing this and the black tank check valve fails you could contaminate your fresh water system.
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Old 08-11-2015, 02:24 PM   #12
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I was told that if you use the black water flush you have to have the black water dump valve open.or it will build up pressure in the black tank and contaminate the whole water system. Thats what they told me at the dealer. So when I domp my black tank I leave the dump valve open and run the black tank flush and the spickett I use has a lot of pressure .
Most if not all TT black tanks have vent pipes out the roof so no you would not build up pressure in the tank, but I prefer to have the drain open when spray washing although I do sometimes let the tank level come up a ways with water then drain to get more forceful draining. Think about it, if pressuring was possible in the tank then you would also cause a vacuum to develop in the tank when draining and it wouldn't drain properly so the tank surely is vented.
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Old 08-11-2015, 02:34 PM   #13
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Well I did some research online and I find that you ARE supposed to keep the black tank valve OPEN while using the black tank flush hose connection. I am sure glad I read this forum. I learn something new every day. Thanks to all who put the time in to help !!
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Old 08-11-2015, 02:40 PM   #14
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There are several posts on various forums about people getting distracted or otherwise forgetting that the black tank flush is on with the drain valve closed. They find out when water comes pouring off the roof from the vent. That might be why they say to keep the drain open. As long as the vent is not plugged up you will not pressurize your black tank.
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Old 08-11-2015, 05:00 PM   #15
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When using the black tank flush, I have always used it without having the black tank drain closed and not open. But I watch the black tank indicators and when 2/3 or 1/2 full, I turn off the water going into flush. I then open the drain gate and let the water out of the tank. But you have to watch this and this has to be your one task and I do not multitask while waiting to fill. Do not get distracted. As others have said, if distracted or trying to do something else, you could have a real stinky problem. This is my 4th RV in 20 years doing it this way and I have not had a problem.
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Old 08-11-2015, 06:30 PM   #16
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Same for me

I flushed mine this week at our seasonal campground (without full hookup). I let the black tank fill for several minutes and then drain. I filled my 45 gallon tote 3 times in order to get clear water running from the black tank.

I had always kept the dump valve open in prior sessions but decided that this time I would change my procedure, and it turned out to be in my favor. I let the flush water run clear for several minutes and then close the dump valve. Every time I opened the dump valve I got another batch of sewage. I kept doing this until my dumps ran clear. This tells me that in my tank just running the black tank flush does not really flush the tank. Your mileage may vary but this works for me.
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Old 08-11-2015, 08:27 PM   #17
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The black tank is a sealed system, when pressurized with water pressure something has to give. Mine says "open valve before connecting water".
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Old 08-11-2015, 09:23 PM   #18
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Mine isn't sealed, there's a vent to the roof. I've owned 3 fifth wheels and they all had vented tanks. You can tell when someone in a campground flushes a toilet into a dirty tank, bad odor surrounds the camper, from the roof vent.
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Old 08-11-2015, 09:46 PM   #19
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Originally Posted by 5sporty5 View Post
I was told that if you use the black water flush you have to have the black water dump valve open.or it will build up pressure in the black tank and contaminate the whole water system. Thats what they told me at the dealer. So when I domp my black tank I leave the dump valve open and run the black tank flush and the spickett I use has a lot of pressure .
On ours it has a sign stating you need to open the dump valve before flushing - right by the water flush hook up. I don't want to find out what might happen if I forget to do this.
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Old 08-11-2015, 10:19 PM   #20
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The reason for the sign is that the black tank "flushing" system is a spray wand built into the black tank. With the dump valve closed, the tank level will soon cover the wand, and the spray becomes totally ineffective because it's trying to "spray" through water. The tank is vented so pressure cannot build up, assuming the vent is not plugged.
However, if it's not attended to and allowed to overfill, black tank water can either 1. Overflow the vent pipe onto the rv roof, or 2. Seep back around the toilet flush valve seals inside the rv.....or both. Either way will provide for some stinky cleanup duties.

One tip I've learned is that when I leave a campsite headed home, the tanks are all dumped, then a good "squirt" of Dawn dishwashing liquid is poured into the toilet along with 3-4 gallons of water. The insides of the tank remain soapy and slick with the highway agitation. After I get home, I fill the black tank, and then dump. (Yes, I have a proper place). Odors are rare.

Hope that helps someone
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