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Old 07-04-2015, 02:07 PM   #1
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Check Valve on Black Tank Flush

We can't get water to go into our Black Tank flush inlet, and someone suggested that we might need to reset our check valve. My question is where is the check valve on a 2015 Sunseeker 2300 Class C?
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Old 07-04-2015, 02:20 PM   #2
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clogged nozzel in tank a possibility too...
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Old 07-04-2015, 02:38 PM   #3
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On my Flagstaff, it is directly behind the inlet hose connection. I would suspect it might be installed backwards. You should be able to take a pencil or a phillips screwdriver and press in on it. If you can't, it's installed backwards.
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Old 07-04-2015, 02:48 PM   #4
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It used to work, so I don't think it's an installation issue. I am hoping someone can tell me where the check valve is on a Sunseeker. I can't find it anywhere.
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Old 07-04-2015, 02:53 PM   #5
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It used to work, so I don't think it's an installation issue. I am hoping someone can tell me where the check valve is on a Sunseeker. I can't find it anywhere.
Where you hook the hose is a coned screen and rubber washer, with a small screw driver pull the washer and screen out the valve is behind the screen.
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Old 07-04-2015, 03:03 PM   #6
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We did that already. We don't see anything in there.
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Old 07-04-2015, 03:22 PM   #7
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Shine a light in there.

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Old 07-04-2015, 03:39 PM   #8
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Thanks. I still don't see anything in there. It's just a black hole. I can stick the little screwdriver all the way in.
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Old 07-04-2015, 03:51 PM   #9
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Ok on one side or the other is there a door?
If so is there a panel on one side or the other of where the hose hooks to.
There will be some screws that need to be removed, you may need a #2 square drive tip.
Remove enough screws to pull the panel out enough for you to look.
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Old 07-04-2015, 03:59 PM   #10
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My 2900 did the same thing. Not sure where yours is, but first I would under the bathroom vanity. I had to remove a drawer to expose all the connections for the cold and and hot fresh water, as well as the check valve assembly. Make sure all the pressure is off in the water lines, and remove the black plastic assembly that is the check valve. My valve was fine, but I took my air compressor tip and stuck it in the open pipe that goes into the black tank. Lower the regulator to 50-60 psi and blow it out good. It turns out mine was clogged somewhere in the black tank, not allowing water in. I just had to remove to check valve to get to it.
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Old 07-04-2015, 04:08 PM   #11
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It used to work, so I don't think it's an installation issue. I am hoping someone can tell me where the check valve is on a Sunseeker. I can't find it anywhere.
Have you looked in the hose connection?
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Old 07-05-2015, 12:21 PM   #12
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Black water check valve

I had same issue with my brand new XLR from the factory. They installed the valve backwards at the factory. It is located in the cabinet under the bathroom sink.
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Old 07-05-2015, 12:26 PM   #13
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I had same issue with my brand new XLR from the factory. They installed the valve backwards at the factory. It is located in the cabinet under the bathroom sink.
Those valves can also go bad. Ours had a backflow hooked to the outside hose connection, so I just took the valve under the bathroom sink out along with all the hoses.
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Old 07-05-2015, 01:17 PM   #14
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Check valve is somewhere in the line between connection and tank
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Old 07-05-2015, 03:56 PM   #15
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The problem I am having is when I try to flush my black tank, I hear water going into the tank, but I also have water running out by the rear tire fender well. Any thoughts on this?
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Old 07-05-2015, 04:14 PM   #16
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The problem I am having is when I try to flush my black tank, I hear water going into the tank, but I also have water running out by the rear tire fender well. Any thoughts on this?
Could be a cracked valve or a hole in your line and that's where it is draining out.
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Old 07-05-2015, 08:26 PM   #17
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Ok. Thank you for your reply. I will check when I have a chance.
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