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Old 08-24-2020, 04:13 PM   #1
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Blank Tank Flush - Not Working

Just got a 2020 FR Chaparral 370FL. The connection for the black tank flush is located where the water controls are in the pass-thru storage area. When a hose is connected to the black tank flush and turned on nothing happens. The water does not flow through. It is as if there is some sort of closed valve not allowing the water to flow to the sprayers in the black tank.

Although I had not ever heard of a black tank flush "valve" I thought I would look around for one just in case it was a new add in the newly 2020 built models. I looked everywhere but with no luck of finding one.

Not sure what else I can try. I hook up the hose, turn on the water and nothing. No flow.....could the water flow be getting stopped by a bad flush vacuum breaker/check valve which is located directly behind the connection?

Any suggestions are appreciated. Thanks
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Old 08-24-2020, 04:42 PM   #2
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Check to make sure it is oriented so the direction of flow is correct. A lot are backwards from the manufacturer.
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Old 08-24-2020, 04:50 PM   #3
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Mine failed out of the box , spring on the check valve was way to tight,Cut back 2 loops to lessen the tension. The flow though mine is aweful, Gave up on it for now and just use the flush wand I made of old commercial dishwasher spray arms
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Old 10-05-2020, 06:31 PM   #4
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My Salem 26 DBUD is the same, hook up the water to the black tank flush and no water goes into the tank at all. Like there is a valve turned off and won’t allow any flow.

Was thinking maybe a valve in by the hot water tank. Will go looking for one.
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Old 10-05-2020, 06:40 PM   #5
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Theres a backflow preventer in the line. Its usually up high so check under the bathroom sink (thats where mine is). Sometimes they are installed backwards. The incoming flow should lift the valve.
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Old 10-05-2020, 06:51 PM   #6
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Quote:
Originally Posted by mogman View Post
Theres a backflow preventer in the line. Its usually up high so check under the bathroom sink (thats where mine is). Sometimes they are installed backwards. The incoming flow should lift the valve.
I found a black something zip tied up under the sink with a white hose going in and a white hose going out.

Is this it??
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Old 10-05-2020, 07:01 PM   #7
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Yup that's it ,
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Old 10-05-2020, 07:03 PM   #8
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The screw holding it in is a square bit .
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Old 10-05-2020, 07:04 PM   #9
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Yup that's it ,
Dang, was afraid of that! How the heck do I test that out?

Well, itís going in for a laundry list of deficiencies so Iíll add this to the list.
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Old 10-05-2020, 07:09 PM   #10
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Take it out,Pull apart the check valve, you can leave the spung& ball out to test it.
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Old 10-05-2020, 07:10 PM   #11
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Spring
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Old 10-05-2020, 07:11 PM   #12
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Originally Posted by Chris Pastuzyn View Post
Take it out,Pull apart the check valve, you can leave the spung& ball out to test it.
Thank you. Will do!
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