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Old 07-08-2014, 08:58 PM   #1
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3170ds black water flush

My black water flush has stopped working. Any idea how to trouble shoot this? I've heard there is a valve one can check however I'm not sure where it is locate and how one would check it. Thanks.
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Old 07-11-2014, 07:00 AM   #2
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More than likely something got into the flusher head. This happened to me. I took the backflow preventer apart thinking it was the culprit. When I got water straight through it then I knew it must be something in the line or in the head.
Black tank empty - I pulled the assembly from the tank and sure enough "stuff" was clogged in the head. The head is only an apparatus with a cap and about a dozen fine holes in it. I cleaned it and chased the holes with a drill bit.
Its made by Catalog - B & B Molders LLC - Custom Plastic Injection Molding

Bobby
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Old 07-11-2014, 11:53 AM   #3
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Thanks. Where did you find it and how did you test it?
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Old 07-11-2014, 01:00 PM   #4
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Find what; the backflow device or the spray head?
The backflow device is located in my bathroom under the vanity counter. The spray head is located on the passenger side of the black tank (mine is right over where the water pump is located).
There are 3 screws that secure the spray head onto the tank. Remove the screws and the sealant and the spray head will come out with some effort.

As for testing, I ran water through the spray head and continued cleaning until all the sprayer holes were flowing.
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Old 07-11-2014, 02:48 PM   #5
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Thanks. How did you test the black flow device?
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Old 07-11-2014, 03:04 PM   #6
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It's a backflow - water in the inlet side will flow. Reverse the flow - trying to flow water in from the outlet - results in no flow.
I removed the backflow and tested with a garden hose.
The backflow has a spring to help the check valve. In past, I've had plumbing debris lodge on the spring side of the check valve preventing the check valve from opening. That was not the case this time for me.

If you can get a helper, you can check for flow all the way to the spray head by removing the waterline at the spray head and routing it to a bucket while the helper operates the water supply into the flush connection on the other side. A good water flow into the bucket means everything is good to that point.

Bobby
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