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Old 08-25-2013, 08:44 PM   #1
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Tank flush questions

So my buddy has a keystone hideout. He has the same type of black tank flush that is on Jayco. They seem to be a standard tank flush for allot of brands. I was told and read open valve then use tank flush. He was told not to open valve. Keystone seems to be having a problem with the check valve. It causes s leak. My question is has anyone had problems with the tank flush and how do you operate the flush system.
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Old 08-25-2013, 09:04 PM   #2
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No problems with mine. I leave the valve open for a few minutes, then I will close it for a minute, then open it back up. On the Black Tank Flush I think it says something like make sure the valve is open.
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Old 08-25-2013, 09:44 PM   #3
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Quote:
Originally Posted by katgar05 View Post
No problems with mine. I leave the valve open for a few minutes, then I will close it for a minute, then open it back up. On the Black Tank Flush I think it says something like make sure the valve is open.
This is the way I do it also.
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Old 08-26-2013, 04:40 AM   #4
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A defective check valve will cause a leak at that point. The only solution I know of is to replace the valve. I did that on my 2004 Designer, and everything has worked fine since. The main reason for opening the valve first is to prevent build up of pressure, which would make a mess. I open the valve and immediately also turn on the hose to the flusher. After the flow (as seen through a clear fitting) diminishes, I shut the valve, wait about 2 minutes with the flusher still going, then shut off the flusher and open the valve. When only a trickle is coming out, close the valve and I'm done.
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Old 08-26-2013, 06:57 AM   #5
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I would say there is no best way or approved method. What ever works for you.

Just don't walk away with the valve closed and the flusher on. Don't ask me how I know!
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Old 08-26-2013, 08:58 AM   #6
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Yesterday I was in a bit of a hurry... drained my black tank and while the grey tank was draining I ran the black tank washer. All clean and ready for next weekend!!!

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