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Old 06-04-2019, 11:16 PM   #1
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Black water tank flush system

Dumped my black water tank today and decided to flush it, which I haven't done for a while. I know, I know. No remarks about doing it every time. Hooked the hose up to the flush inlet and turned on the water. Heard the water pressure build up but it did not flow and could not hear it spraying. Turned the water off and on several times but no change. I could hear a clicking sound. Did some research on the internet and found that some have back flow valves so I think that is what I heard clicking. So my question is, where is the sprayer located on the tank and how do I get to it. I read also that using a chemical called Unique RV Digest-it can clean off the sprayer head with out taking it out of the tank. If I can find that, I will try if first. My RV is a 2007 Forest River Georgetown 378XL which we are living in inside our garage while building our house on the other side of our building.
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Old 06-05-2019, 05:14 AM   #2
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Your 2007 GT 378 looks the same as my 2012 and access to the tank sprayer is from behind the water heater. You will have to open the hatch surrounding the water heater. It is a pita but doable.
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Old 06-05-2019, 05:25 AM   #3
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I sure hope you allow for adequate ventilation (air exchange) inside that garage.
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Old 06-05-2019, 07:23 AM   #4
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Starting with inspecting / replacing the antisiphon valve seems easier and less messy to me. That's where I'd start.
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Old 06-05-2019, 07:26 AM   #5
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The back flow valve is normally in the hose connection on the side of the RV or in the wet bay. Occasionally they are installed backward.
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Old 06-05-2019, 07:49 AM   #6
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I don't know about Georgetowns but all R/V's I've owned the black tank flush backflow/antisiphon valve was under the bathroom sink or behind the shower.



Oh... and don't beat yourself up about flushing EVERY time. There is no need and until just several years ago, (10-15) black tanks never had a flush. Many units still don't.
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Old 06-05-2019, 07:52 AM   #7
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Quote:
Originally Posted by Flybob View Post
The back flow valve is normally in the hose connection on the side of the RV or in the wet bay. Occasionally they are installed backward.
The backflow check valve/vacuum breaker for black tank cleanouts is normally installed inside the unit above floor level (at least 6" above toilet rim) under vanities, hidden in walls etc. There is no check valve at the input port (typically). In the OP case it is probably where mine is located; in the washer/dryer provision closet about 5 feet above the floor.
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Old 06-05-2019, 01:19 PM   #8
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This is actually pretty common... the saniflush nozzle in your black tank is probably same as mine on several different coaches I had,,, Just a plastic cup which is bolted down into the tank with tiny pin holes in it - lousy cheap design but this the most common approach. Those pinholes plug up easily either with tiny debris particles or more likely hard water deposits. Just happened to me on my new 2019 Forester. Having been thru this before, I instructed the warranty service tech to pull it out, drill all the pin holes out a little larger and as before that cured it 100%. Forest River covered it on warranty, but if no warranty it is an easy fix... I did it on two other coaches in years past. See the diagram below.
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Old 06-05-2019, 02:21 PM   #9
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Originally Posted by jbrosecity View Post
This is actually pretty common... the saniflush nozzle in your black tank is probably same as mine on several different coaches I had,,, Just a plastic cup which is bolted down into the tank with tiny pin holes in it - lousy cheap design but this the most common approach. Those pinholes plug up easily either with tiny debris particles or more likely hard water deposits. Just happened to me on my new 2019 Forester. Having been thru this before, I instructed the warranty service tech to pull it out, drill all the pin holes out a little larger and as before that cured it 100%. Forest River covered it on warranty, but if no warranty it is an easy fix... I did it on two other coaches in years past. See the diagram below.
I believe this is what's installed by the factory in the OP's GT 378 but yes does sound like the tank nozzle is clogged.
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Old 06-05-2019, 03:27 PM   #10
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Quote:
Originally Posted by 5picker View Post
Oh... and don't beat yourself up about flushing EVERY time. There is no need and until just several years ago, (10-15) black tanks never had a flush. Many units still don't.
Neither our 2007/8 Cherokee 38P Destination Trailer nor our 2002 SOB have flushers.

We've never had an issue.

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