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Old 03-22-2017, 02:34 PM   #1
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2008 Allegro 34TGA plugged black tank flush

Worked perfectly until 3 days ago. Now there is zero flow thru the connection into the black tank. Can't think of anything I did to cause the blockage. Tank and drain work perfectly, issue is only with the black tank flush system.

The complete lack of flow (as confirmed by a flow meter) makes me suspect it's not just some junk clogging the line, but something of a mechanical nature.

Any ideas what might be the cause of the blockage, and how to fix it? How to gain access to the tank end of the flush system?
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Old 03-22-2017, 06:35 PM   #2
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There is usually a check valve in the line somewhere as well as a vacuum breaker so maybe the checkvalve has collapsed and blocking the flow. It happens on the check valves on HWS and on the mains inlet fitting so maybe does the same on the flush line.
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Old 03-22-2017, 07:30 PM   #3
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Also the tank end of the flush system is a spray head so a little crud or a frog or a large bug could plug it. I have plugged mind with ice that was inside the hose. I would start at the vacuum breaker as it is the easiest to repair.
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Old 03-23-2017, 04:59 PM   #4
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If your plumbing is like mine , the check valve and vacuum breaker are under the bathroom sink. You could start there by loosening the bottom connection and see if you have water there , then work your way to the other end.
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Old 03-24-2017, 04:03 PM   #5
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Thanks for the tips, guys. I am due to return home within the next few days, and will use your info to attempt to get it working again. Will report back if/when I find/fix the problem. Much appreciated.
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Old 05-29-2017, 01:16 PM   #6
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Finally got around to fixing the problem. There is a check valve installed on the line and located under the secondary lavatory sink. Removed the valve, jostled it to ensure nothing was stuck and replaced it. Worked perfectly afterwards.

Thanks for the tips.
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Old 05-31-2017, 02:41 PM   #7
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black tank flush

Have a similar problem. No srpraying. Purchased a new check valve ($100), replaced it.........Nothing, nada!!
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