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Old 10-20-2016, 03:29 PM   #1
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Black water flush problem

So dumping the tank on my 2015 Surveyor 292RETS I hook up the hose to the black water flush and nothing happens. Am I forgetting to do something?
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Old 10-20-2016, 03:34 PM   #2
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There have been several reports here of the back-flow/anti-siphon valve in the tank flush line being installed backwards from the factory.

It is 'usually' located near the underneath of the sink in the bath.
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Old 10-20-2016, 03:50 PM   #3
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Originally Posted by Moose34 View Post
So dumping the tank on my 2015 Surveyor 292RETS I hook up the hose to the black water flush and nothing happens. Am I forgetting to do something?


Looked under the sink. Not there. Any other areas?
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Old 10-20-2016, 06:49 PM   #4
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Try following the line from the back side of the outside connection for the flush.
Depending on the unit, sometimes you can see where the lines go.
If so, the outside connection will first go to the back-flow/anti-siphon valve, then to the tank. Usually a black plastic valve.
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Old 10-20-2016, 07:02 PM   #5
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I'll have to do that when it's light out. The under body is all covered so it shall be an adventure
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Old 10-20-2016, 07:03 PM   #6
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The antisiphon valve should be installed several inches above the inlet immediately inside. The hose goes up to the valve and then down to the black tank.

Here's a picture of mine except the black plastic antisiphon valve has been replaced with a grey elbow by the previous owner. The plastic valves are known to break. Sorry the picture is on its side.

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In your floor plan, it looks like the black tank flush port is on the wall behind the kitchen counter so have a look in that cabinet.
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Old 10-20-2016, 07:24 PM   #7
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Originally Posted by itat View Post
The antisiphon valve should be installed several inches above the inlet immediately inside. The hose goes up to the valve and then down to the black tank.

Here's a picture of mine except the black plastic antisiphon valve has been replaced with a grey elbow by the previous owner. The plastic valves are known to break. Sorry the picture is on its side.

Attachment 123522

In your floor plan, it looks like the black tank flush port is on the wall behind the kitchen counter so have a look in that cabinet.


Do you have a specific link to the layout?
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Old 10-20-2016, 07:27 PM   #8
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Originally Posted by itat View Post
The antisiphon valve should be installed several inches above the inlet immediately inside. The hose goes up to the valve and then down to the black tank.

Here's a picture of mine except the black plastic antisiphon valve has been replaced with a grey elbow by the previous owner. The plastic valves are known to break. Sorry the picture is on its side.

Attachment 123522

In your floor plan, it looks like the black tank flush port is on the wall behind the kitchen counter so have a look in that cabinet.


Do you have a link for the layout?
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Old 10-20-2016, 07:50 PM   #9
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I just found pictures of the unit online. On those pictures, the flush port is inside the pass through (on the rear wall) and under the bathroom which would be the wall behind the kitchen counter.

http://www.midamericarv.com/rv/carth...rveyor+292rets
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Old 10-20-2016, 07:51 PM   #10
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Originally Posted by itat View Post
I just found pictures of the unit online. On those pictures, the flush port is inside the pass through (on the rear wall) and under the bathroom which would be the wall behind the kitchen counter.


Okay thank you. I'll look into it in the am
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Old 10-20-2016, 07:52 PM   #11
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So dumping the tank on my 2015 Surveyor 292RETS I hook up the hose to the black water flush and nothing happens. Am I forgetting to do something?


Turn the water on.

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Old 10-21-2016, 07:48 AM   #12
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You will be looking for something like this...
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Old 10-21-2016, 08:28 AM   #13
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When I used mine the first time I thought it wasn't working but after about 3 min (hooked up and pressurized) I could hear it working and water coming out the dump pipe. I found mine behind the entertainment center just above where my power comes in.
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Old 10-21-2016, 08:41 AM   #14
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They like to Hide them! Here is another hiding place,behind the Toilet closet! Ours was Broken/leaking the 1st time we used it,Major work to Dismantle and "Cut a Door" just to repair/replace the Valve and Clean up the Mess! Youroo!!
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Old 10-23-2016, 07:33 AM   #15
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Turn the water on.

That was my first thought
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Old 10-27-2016, 08:53 AM   #16
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I noticed when I went to winterize the system, some water on the floor under the sink area coming from the vacuum break. I did flush out the tanks thoroughly at the CG and see some drips of water around the vac break. Does this mean it's bad? How do you test them? Can it be cleaned and reinstalled? Boy howdy are they pricey. I see Valterra and JR product make them. Either one will cost you about $50 before you're done with the freight and tax. Any experience?
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Old 10-27-2016, 11:55 AM   #17
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The only way to test them is to use them and see if they are leaking, unless you want to rig up something to pressure test with air.

I bought this inexpensive replacement valve from HD to use on the hose at the inlet port.
Everbilt 3/4 in. Hose Bibb Vacuum Breaker-VACBFPZ4EB - The Home Depot

Of course, you'll also need to replace the original black plastic anitsiphon valve with a 90° bend.
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Old 10-27-2016, 12:03 PM   #18
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Mine was seeping, so I just removed it completely and eliminated about 5-6' of tubing and hooked the hose directly to the tank from the inlet which has a check valve in it from the factory.
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