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Old 07-21-2020, 03:42 PM   #1
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How to use black tank flush

Hi all,

First timer here. My wife and I just purchased our first RV three days ago and we couldn't wait to take it for a spin. We bought a new 2021 Wildwood 26DBUD travel trailer. We used it for a quick 2 day camping trip at a local lake and everything went fine for the most part. We only had 3 issues, one of which I am posting here. My question is about the black tank flush. When I went to dump the tanks today, I connected the dump station hose to the black tank dump port after the black tank seemed to be empty, but when I turned the hose on I never saw any additional water come out of the black tank even though I left the dump valve open. I couldn't really hear any water flowing into the RV through the tank flush port either. Is there a second valve I'm supposed to open somewhere to "enable" the black tank flush? The guy at the dealer that did my walkthrough didn't mention anything about it.

Thanks in advance.

Shawn
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Old 07-22-2020, 06:24 PM   #2
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My grey wolf 26DBH has a black tank flush as well.

No valves. Just screw the hose on and turn on the water.

Not to sound stupid, but are you sure water was coming out the hose?

Mine almost instantly has water coming out the dump valve
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Old 07-22-2020, 07:06 PM   #3
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Quote:
Originally Posted by lizARdman15 View Post
My grey wolf 26DBH has a black tank flush as well.

No valves. Just screw the hose on and turn on the water.

Not to sound stupid, but are you sure water was coming out the hose?

Mine almost instantly has water coming out the dump valve
Thanks for the response. That's what I thought it was supposed to do as well. I read somewhere on here where someone had a new RV and the black tank flush check valve was installed backwards. I'm wondering if that's what is wrong with mine.

Yeah there was water coming out of the hose. That was the first thing I checked. I could also tell there was water because the garden hose from the dump station didn't seal perfectly and was spraying a jet of water from the connection. Not enough to cause a drop in pressure but enough for the jet to land about 6ft away.

I'm going to call the dealer in the morning and see what they say about it.
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Old 10-05-2020, 06:35 PM   #4
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Quote:
Originally Posted by sstandfast View Post
Thanks for the response. That's what I thought it was supposed to do as well. I read somewhere on here where someone had a new RV and the black tank flush check valve was installed backwards. I'm wondering if that's what is wrong with mine.

Yeah there was water coming out of the hose. That was the first thing I checked. I could also tell there was water because the garden hose from the dump station didn't seal perfectly and was spraying a jet of water from the connection. Not enough to cause a drop in pressure but enough for the jet to land about 6ft away.

I'm going to call the dealer in the morning and see what they say about it.
I have the exact same problem with my 2021 Salem 26 DBUD. Will go looking for a check valve and see what I find. Thank you for posted and keep me posted if you found a solution.
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Old 10-05-2020, 07:21 PM   #5
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So it's still going to be a 3 month wait for Forest River Service to check this out. So instead this weekend while we had the RV out, I decided to take a look at what is going on. Turns out, there isn't an external check valve built into the hose port so that's not the issue. I also determined that the backflow preventer/ vacuum breaker was installed correctly, the issue is there is apparently a restriction in the line between the external hose port and the vacuum breaker/ backflow preventer. Even with the hose connected full power to the inlet port, there was just a trickle coming out the end of the pipe feeding the breaker. So there is either a kink in the PEX somewhere under the floor or some bit of construction debris stuck in the pipe. We're going out again next weekend and I'll let you know what I find.
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Old 10-05-2020, 07:32 PM   #6
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Quote:
Originally Posted by sstandfast View Post
So it's still going to be a 3 month wait for Forest River Service to check this out. So instead this weekend while we had the RV out, I decided to take a look at what is going on. Turns out, there isn't an external check valve built into the hose port so that's not the issue. I also determined that the backflow preventer/ vacuum breaker was installed correctly, the issue is there is apparently a restriction in the line between the external hose port and the vacuum breaker/ backflow preventer. Even with the hose connected full power to the inlet port, there was just a trickle coming out the end of the pipe feeding the breaker. So there is either a kink in the PEX somewhere under the floor or some bit of construction debris stuck in the pipe. We're going out again next weekend and I'll let you know what I find.
Thanks for the update. What a pain in the ass. I found the check valve under the sink, a kink in the hose sounds more like what I have going on, as absolutely no water goes in that black tank flush, since day 1.
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Old 10-05-2020, 10:39 PM   #7
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Had a similar issue, the hose from the outside connection port to the tank was kinked.
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Old 10-05-2020, 10:55 PM   #8
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Had a similar issue, the hose from the outside connection port to the tank was kinked.
Thank you will check that out as well!
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Old 10-06-2020, 07:28 AM   #9
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Iíd be willing to bet that checking the function of the black tank flush is not on any PDI checklist. Based on all the reports of non-functioning flushes, it should be!
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