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Old 10-13-2020, 11:49 AM   #1
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black tank flush

We were winterizing our 2018 3011 DSF. When we attached a hose to the black tank flush, no water came out after a minute or so. We have flushed many times before and knew something wasn't right. We shut the water off to the hose and I could see water running onto the ground on the opposite side of the motor home. I went in to find the bedroom and shower area flooded with water. We cleaned up and then found that the storage compartment with the water pump was also flooded. We tried looking under the motor home but it seems everything is sealed. We are also in our upper 70's and crawling around under a motor home is not easy for us. We will need to hire someone to repair this and was wondering if there is any type of diagram for the plumbing system that might help them.
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Old 10-13-2020, 12:04 PM   #2
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Unfortunately, plumbing diagrams do not exist for most models of R/Vs.

You have likely experienced a bad anti-siphon/check valve for the black tank flush.

I don't want to say it is a common problem but there are several others who have experienced the same issue as you.

Often times this anti-siphon/check valve is located under the bathroom sink or an area near that. Whan they go bad/leak they flood the vanity or wherever it is located. (sometimes behind a shower wall)

It is almost always a plastic valve (from the factory) and looks like what I posted in the photo below. They are not hard to change but are directional so be sure to install it correctly. Many replace them with a better quality brass valve. Some folks simply remove it and couple the lines together. if you do so, you should use an inline check valve on the supply hose to eliminate contaminating the supply water if there is a catastrophic pressure loss while flushing.

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Old 10-13-2020, 04:09 PM   #3
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Not under sink

I went right over to the storage yard and checked and there wasn’t a valve like that under our bathroom sink. It must be under the bed. I checked the storage compartment either the water pump and it isn’t there. No way I can see to get in around or behind the shower. Will next put the bedroom slide out and look under the bed. If anyone else has found it in a 3011 days please let me know.
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Old 10-13-2020, 05:19 PM   #4
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This was in another thread in the Sunseeker section... perhaps you have something similar.

https://www.forestriverforums.com/fo....php?p=2432111
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Old 10-13-2020, 07:35 PM   #5
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I have looked for the described valve in out 2020 Sunseeker and have not found it. I see the feed line for the black tank flush leaving the tank and disappearing up through a floor penetration, but I see no valve accessible in any interior cabinetry. I have looked under the sinks, oven, behind wardrobe drawers, even above the furnace. Perhaps they buried in an interior wall and it’s not accessible without requiring some wall panel disassembly.
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Old 10-13-2020, 08:07 PM   #6
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Quote:
Originally Posted by Sherol View Post
I went right over to the storage yard and checked and there wasn’t a valve like that under our bathroom sink. It must be under the bed. I checked the storage compartment either the water pump and it isn’t there. No way I can see to get in around or behind the shower. Will next put the bedroom slide out and look under the bed. If anyone else has found it in a 3011 days please let me know.

See if there is an accessible area directly inside from where the flush hookup is. The valve should be very close to that.
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Old 10-14-2020, 12:24 PM   #7
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black tank flush valve

Does anyone know where I can locate the anti-siphon/check valve for the black tank flush on a 2018 Forester 3011 dsf motor home. It is broken and flooding the motor home when we tried to use it. Just can't find it to repair or replace it.
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Old 10-14-2020, 12:42 PM   #8
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Quote:
Originally Posted by Sherol View Post
Does anyone know where I can locate the anti-siphon/check valve for the black tank flush on a 2018 Forester 3011 dsf motor home. It is broken and flooding the motor home when we tried to use it. Just can't find it to repair or replace it.


I believe it’s under the bathroom sink.
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Old 10-14-2020, 12:54 PM   #9
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I have already checked and it is not there.
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Old 10-14-2020, 01:03 PM   #10
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Run your black tank flush and listen inside your unit. My check valve/vacuum breaker SOUNDS LIKE it’s in the wall of my Wildcat 5er behind the shower enclosure!
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Old 10-14-2020, 01:08 PM   #11
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I too have recently discovered this problem. I just tried the tank flush on our new-to-us 3170, only the find no flow. I will look for our check valve or vacuum breaker tomorrow. Is it possible that it is integral to the hose connection port, similar to the city water connection?
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Old 10-14-2020, 01:45 PM   #12
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The last time we ran it it flooded the bedroom floor and filled two storage compartments with water. So I am thinking it may be under the bed. Will pull the slide out and lift the bed and see. Since we are in storage and have no water available, it would be difficult to run water to find it.
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Old 10-14-2020, 01:51 PM   #13
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Notice this from the other thread referenced above:
Quote:
Originally Posted by bubbles View Post
Where ever it is it will be above floor level at least 6" above the toilet rim height. Check under the lav vanity.
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Old 10-14-2020, 02:19 PM   #14
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Quote:
Originally Posted by Sherol View Post
Does anyone know where I can locate the anti-siphon/check valve for the black tank flush on a 2018 Forester 3011 dsf motor home. It is broken and flooding the motor home when we tried to use it. Just can't find it to repair or replace it.


The only other place I can think it might be is behind the access in the shower, under the shower faucet valves there is an access panel (round). Sorry our’s is in storage so I can’t check.
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Old 10-14-2020, 06:21 PM   #15
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black tank flush

Quote:
Originally Posted by Badabbotts View Post
The only other place I can think it might be is behind the access in the shower, under the shower faucet valves there is an access panel (round). Sorry our’s is in storage so I can’t check.


Went and checked, it is in the shower wall....Click image for larger version

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Old 10-14-2020, 06:53 PM   #16
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Quote:
Originally Posted by Badabbotts View Post
Went and checked, it is in the shower wall....Attachment 241184Attachment 241185
Hard to see but I assume the “it” refers to the vacuum/check valve? In which model number Forester was this picture taken?
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Old 10-14-2020, 07:04 PM   #17
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Originally Posted by emm-dee View Post
Hard to see but I assume the “it” refers to the vacuum/check valve? In which model number Forester was this picture taken?


Forester 3011, 2019
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Old 10-14-2020, 08:23 PM   #18
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Thank you all for your advice. I'll check out the shower tomorrow and see if it is there.
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Old 10-14-2020, 08:31 PM   #19
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Quote:
Originally Posted by Badabbotts View Post
Went and checked, it is in the shower wall....Attachment 241184Attachment 241185
Great idea to look in the shower wall under the shower valves. Nope. The black tank flush valve was not there on my 2020 Sunseeker 2440DS. I looked in the access hole under the shower, and I looked behind the shower and behind the fresh water tank, as visible when removing a drawer on the bed base. Nope. I have a feeling the valve is buried inside a wall near the coat closet on the passenger side, with no access plate available to reach it.
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Old 10-14-2020, 09:23 PM   #20
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Should not need to look low. It must be above the “non fresh” water outlet that it feeds. That is why the vacuum breaker on the toilet is raised up in the back behind the seat. The black tank flush vacuum breaker will be above the flush nozzle ... somewhere.
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