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Old 11-05-2017, 08:30 AM   #1
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No Water Flow Through Black Tank Flush

I have used the black tank flush many times on our unit in the past four years. My last trip, I drained the black and grey tanks, as usual, and hooked the hose up to the black flush. When I turned the hydrant on, it was as if a valve was closed -- zero flow. The first thing I checked was the in-line water screen, which was clean. There was 62 psi water pressure, so no problem there. Any suggestions would be greatly appreciated.
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Old 11-05-2017, 08:40 AM   #2
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Next thing in line is the "Backflow valve" check it! Youroo!!
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Old 11-05-2017, 08:47 AM   #3
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Where is the backflow valve?
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Old 11-05-2017, 09:10 AM   #4
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Between the fitting on the Outside Wall and the Black tank! It is usually located above the wall entrance point,inside a Base cabinet or inside a wall near the shower! Youroo!!
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Old 11-05-2017, 12:25 PM   #5
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I've checked around the pump/house filtration area and the area in the closet access to the shower valve. Does anyone know where the backflow preventer (check valve) is on a Forester/Sunseeker 3051/3050 is?
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Old 11-05-2017, 01:23 PM   #6
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The first thing I would do is to apply air pressure to the fitting going into the black water valve. A couple of blasts should clear the spray nozzles inside the tank should clear the debris that has clogged the nozzles. Worked for me and many others. Happy Trails
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Old 11-05-2017, 01:37 PM   #7
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What was the time frame between usages on the flush? Has it been over six months? It is easier to start with air pressure. If you have ruled out the backflow preventer you could fill the black tank, add a heavy concentrate of tissue dissolver and let it soak for a week or so. Then try the air/water flush. Once you have established a small flow the trick would be to let it run for hours. Just monitor the black tank level as always.
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Old 11-05-2017, 01:46 PM   #8
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Mine got stuck on my 2nd or 3rd trip out, would not let any water through at all. I just stuck the hose down the toilet to flush for that trip. When I got home I shot some WD/40 into the hose connection let it sit for a while, shot some more WD in there, let it sit some more. Hooked up my hose with the water pressure regulator attached, and it worked again. Was happy I didn't have to take anything apart. Haven't had any more trouble since then, it has been a little over a year. I am not impressed with the black tank flush system in the first place. Sure I use it and run it for a long time, then I use one of those Camco wands. I bought the cheap one first and was surprised at how much more "stuff" came out. That made me think that maybe I would get the better one they make that has the flexible hose with the spinner sprinkler thing on the end. Bottom line is I think the least expensive one works better. So I drain the black tank, use the black tank flush while watching what comes out, then the wands. Got off track there, but WD-40 worked to get mine functional again.
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Old 11-05-2017, 01:53 PM   #9
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Quote:
Originally Posted by donanddona View Post
What was the time frame between usages on the flush? Has it been over six months? It is easier to start with air pressure. If you have ruled out the backflow preventer you could fill the black tank, add a heavy concentrate of tissue dissolver and let it soak for a week or so. Then try the air/water flush. Once you have established a small flow the trick would be to let it run for hours. Just monitor the black tank level as always.
I back flush frequently, so it's been nowhere near six months. I have yet to find the backflow preventer valve.
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Old 11-05-2017, 01:57 PM   #10
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Originally Posted by Jack Larson View Post
Mine got stuck on my 2nd or 3rd trip out, would not let any water through at all. I just stuck the hose down the toilet to flush for that trip. When I got home I shot some WD/40 into the hose connection let it sit for a while, shot some more WD in there, let it sit some more. Hooked up my hose with the water pressure regulator attached, and it worked again. Was happy I didn't have to take anything apart. Haven't had any more trouble since then, it has been a little over a year. I am not impressed with the black tank flush system in the first place. Sure I use it and run it for a long time, then I use one of those Camco wands. I bought the cheap one first and was surprised at how much more "stuff" came out. That made me think that maybe I would get the better one they make that has the flexible hose with the spinner sprinkler thing on the end. Bottom line is I think the least expensive one works better. So I drain the black tank, use the black tank flush while watching what comes out, then the wands. Got off track there, but WD-40 worked to get mine functional again.
Thank you. Going to give that a try!
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