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Old 01-11-2013, 06:42 PM   #1
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Exclamation Problem with black holding tank flush system

When I try to use my black tank flushing system it does not work. I attach the water hose to the system and turn the water pressure on the pressure builds up and pops the hose from the conection. the water doesn't enter the tank. Anyone have any ideas. Thanks, Bubbaepp
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Old 01-11-2013, 07:42 PM   #2
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The problem is the spray holes in the business end of the device are too small and they are clogged. If you can get to the spot on the tank where the spray head is mounted you can pull it out and drill the holes out to a larger size. I cleaned mine out twice and the third time it clogged, I drilled the holes out to a larger size. No more clogging.
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Old 01-11-2013, 10:04 PM   #3
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Can't say for sure but on my coach if you trace the hose connection back to where it enters the black tank there is a fitting screwed into the top of the black tank and sealed with silicone. When I removed this fitting I found all the spray holes to be blocked with pulp from toilet paper. I drilled the holes a little bigger and used a piece of wire and water pressure to clean the spray nozzles. Works fine now. Good Luck.
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Old 01-11-2013, 10:06 PM   #4
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Another suggestion would be to check and see if the anti-drain back valve (check valve) that is typically located just after the hose connection is functioning properly. If this check valve is blocked as a result of the internal spool not sliding or moving then you could have a blockage which would not allow water to flow into the flush system even when subjected to city water pressure.

Hope this helps and happy RV'g

Jack
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Old 01-12-2013, 08:12 AM   #5
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The check valve in my system won't let water pass if I turn the water on full blast. If I open the water spigot slowly, I don't have a problem. I really don't understand it, because the check valve is there to prevent flow in the other direction. But I have heard of others having this problem, too. Anyway, the workaround is simple for me and maybe you should try it.
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Old 01-13-2013, 10:33 AM   #6
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Check valves are installed so that in case of a water pressure failure, to prevent your sewage from backing up into a municipal water supply.
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