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Old 09-25-2015, 08:23 PM   #1
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Black Tank Flush Stopped Working

I have a 2011 Sunseeker 2300. I have used the black tank flush many times without a problem. Suddenly it doesn't work.
Does the safety valve just go bad, or does solid waste block the nozzle(s)?

What is the connection to the black tank? Single or multiple openings? How far up the tank? I'm afraid to put too much pressure into the flush. I'd hate to pop a tube and leave the black tank with a hole somewhere.
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Old 09-26-2015, 09:07 AM   #2
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I dont know if there is a check valve or not in the line, but I would not be afraid to run regular hose pressure to the line. The pex lines and fittings will take normal house pressure that is prob under 60 psi.

Sounds like the jet tip is, well, gunked up. I would try a little pure CLR pushed with some compressed air at 60 psi, leave the air line for an hour. If NO JOY maybe pull the air line and let the CLR sit may over night.

If NO JOY I would then try a tab bit of (eco) drain cleaner safe for plastics, pushed by a water hose, but this could be touchy if the drain cleaner gets on the gel coat exterior. Keep a second water hose ready for a rinse down.

Once it works again I would flush the lines and tanks.
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Old 09-26-2015, 09:15 AM   #3
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Your check valve/vacuum breaker has gone bad. Locate it and replace it. I seriously doubt the outlet is clogged. That would be close to impossible.

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Old 09-26-2015, 09:36 AM   #4
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Quote:
Originally Posted by nomad297 View Post
Your check valve/vacuum breaker has gone bad. Locate it and replace it. I seriously doubt the outlet is clogged. That would be close to impossible.

Bruce
May be but that's what happened to mine. Disconnected output side of check valve/vacuum breaker and pressurized tank input tubing with air to unclog nozzle. I suspect TP had settled on nozzle and dried before I needed to dump. I think it happens a lot.
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Old 09-26-2015, 09:50 AM   #5
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Where is the black flow check valve in the sunseeker for the black water flush? At the water line input like for park water? It seems reasonable to clear that step first...
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Old 09-26-2015, 10:00 AM   #6
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Quote:
Originally Posted by Hoglou View Post
Where is the black flow check valve in the sunseeker for the black water flush? At the water line input like for park water? It seems reasonable to clear that step first...
Can't tell you were it is but it is required by law to be inline. Most are located in like your cabinet in the bathroom, but like mine is located behind the shower wall impossible to get to. I can see it when I remove my faucets but it's impossible to remove or replace. That's more then likely then your whole system blocked up at every jet.
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Old 09-26-2015, 10:05 AM   #7
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I think I will pull the black water flush connection when the rain leaves and see if it is in the same place as the fresh water. If so an easy maintenance location.

Maybe davegood will do it sooner....
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Old 09-26-2015, 10:20 AM   #8
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I think I will pull the black water flush connection when the rain leaves and see if it is in the same place as the fresh water. If so an easy maintenance location.

Maybe davegood will do it sooner....
Here is a view showing a typical install. Your check valve may not look like the one shown and the location could be anywhere but this may help with the search.
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Old 09-26-2015, 10:22 AM   #9
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This is typical installation of vacuum break valve.....
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Old 09-26-2015, 10:29 AM   #10
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Thanks for all the help. I fear I have found my valve as per the diagram in the above message. It is behind the bathroom sink, at the very top, and also behind other water lines. I think it is impossible to get to.
Would banging the thing possibly get it to work? I'll try that today.
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