We recently bought a Reflection 337FPS and cannot flush the black tank using the instructions in the owners guide. I did take the RV to a dealer for warranty service and was told it only had a "stuck check valve". I am unfortunately in self quarantine for the COVID-19 virus, but found the same issue this morning. I am leaving the settings for "City Water" as listed on of 120 and connect waste hose to black tank inlet, but no water enters the tank. Right now I can only flush the tank by pushing a cut hose and down the toilet. Am I doing something incorrectly? Thanks for helping this newcomer.
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Originally posted by Fulltimers View PostWe recently bought a Reflection 337FPS and cannot flush the black tank using the instructions in the owners guide. I did take the RV to a dealer for warranty service and was told it only had a "stuck check valve". I am unfortunately in self quarantine for the COVID-19 virus, but found the same issue this morning. I am leaving the settings for "City Water" as listed on of 120 and connect waste hose to black tank inlet, but no water enters the tank. Right now I can only flush the tank by pushing a cut hose and down the toilet. Am I doing something incorrectly? Thanks for helping this newcomer.
From the black tank flush system hose connection point there is a water line that goes up into the camper (usually behind the shower?). That line connects to a one-way valve. From there the water line goes down to the black tank flush spray mechanism.
The purpose of the valve and the routing of the water lines is, obviously, to ensure that water travels in one direction--into the black tank, not out.
I *think* the valve in the black tank flush system is called a Hepvo valve. Someone with more knowledge than I (paging Cate&Rob) will confirm what it is. (What year is your 337RLS? A 2020?)
Edit: Dang--wrong again! Thanks for your expertise (and diagram) Rob.
Last edited by howson; 03-21-2020, 05:26 PM.Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
2017 Ford F-350 DRW, '19 315RLTSPlus
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Just to confirm that you have checked your hose and water is coming out? If you do have water I would bet you still have a stuck check valve....when you can finally get out just replace it, and keep a spare!Keith and Diane
2014 Reflection 337 RLS
2017 Ram 3500 SRW Cummins Mega Cab
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Originally posted by Fulltimers View PostWe recently bought a Reflection 337FPS and cannot flush the black tank using the instructions in the owners guide. I did take the RV to a dealer for warranty service and was told it only had a "stuck check valve". I am unfortunately in self quarantine for the COVID-19 virus, but found the same issue this morning. I am leaving the settings for "City Water" as listed on of 120 and connect waste hose to black tank inlet, but no water enters the tank. Right now I can only flush the tank by pushing a cut hose and down the toilet. Am I doing something incorrectly? Thanks for helping this newcomer.Mark - 2018 Solitude 310GK - Ford F-350 SRW diesel short box - Pullrite Superglide hitch
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Fulltimers
Welcome to our owners technical forum BTW!
To confirm, the black tank flush is completely independent from the Nautilus water distribution system. The valve referenced by Howard (howson) is not part of the black tank flush system. There is one valve in the black tank flush. This is the vacuum break (see attached diagram). If it were stuck "shut" water would still flow to the black tank. If it were stuck "open" flush water would be leaking out and would quickly be noticed on the floor inside the RV. The plumbing lines connecting this system are a black color soft braided hose. The most likely cause of the problem that you describe is a kink in this hose. The other possible problem is debris plugging the spray nozzle in the black tank.
Tracing the black hose lines from water inlet to vacuum break to black tank spray nozzle (looking for a kinked hose) would be the first thing to do.
RobCate & Rob
(with Border Collies Molly & Angel + Kitties Hazel & Elsie)
2015 Reflection 303RLS
2022 F350 Diesel CC SB SRW Lariat
Bayham, Ontario, Canada
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Originally posted by Cate&Rob View PostFulltimers
Welcome to our owners technical forum BTW!
To confirm, the black tank flush is completely independent from the Nautilus water distribution system. The valve referenced by Howard (howson) is not part of the black tank flush system. There is one valve in the black tank flush. This is the vacuum break (see attached diagram). If it were stuck "shut" water would still flow to the black tank. If it were stuck "open" flush water would be leaking out and would quickly be noticed on the floor inside the RV. The plumbing lines connecting this system are a black color soft braided hose. The most likely cause of the problem that you describe is a kink in this hose. The other possible problem is debris plugging the spray nozzle in the black tank.
Tracing the black hose lines from water inlet to vacuum break to black tank spray nozzle (looking for a kinked hose) would be the first thing to do.
Rob
Finally, are all check valves the same in GD products that have a Black Tank Flush?Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
2017 Ford F-350 DRW, '19 315RLTSPlus
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Originally posted by howson View Post
Where is that valve in the Parts Lookup, Rob. Any idea? I looked in the likely spot (Plumbing) but I couldn't find it. It was easy to find an image in Google that matches your diagram but not in GD Parts Lookup.
Finally, are all check valves the same in GD products that have a Black Tank Flush?
I also did some searching and have no explanation for why this vacuum break does not show up on the 2020 Reflection 337RLS parts list (or any other similar model list). Based on many past conversations and assembly plant tours, I know that all Grand Design products use this vacuum break valve on the black tank flush.
RobCate & Rob
(with Border Collies Molly & Angel + Kitties Hazel & Elsie)
2015 Reflection 303RLS
2022 F350 Diesel CC SB SRW Lariat
Bayham, Ontario, Canada
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GDRV-Megan -- can you have the parts folks look into why the black tank flush vacuum breaker/check valve isn't listed in the Parts Lookup website? (See post 5 for Rob's diagram.)Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
2017 Ford F-350 DRW, '19 315RLTSPlus
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Originally posted by howson View PostGDRV-Megan -- can you have the parts folks look into why the black tank flush vacuum breaker/check valve isn't listed in the Parts Lookup website? (See post 5 for Rob's diagram.)
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Originally posted by GDRV-Megan View PostThis is item number 360016. The reason why it wasn't showing up in the parts look up because it is part of the Nautilus system. Parts of parts have to be set up by our vendors and individually uploaded into our catalog.
Where is the vacuum break / air gap located on at 2021 Reflection 28BH?
Thanks
matt
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Originally posted by mattbfarmer View Post
megan
Where is the vacuum break / air gap located on at 2021 Reflection 28BH?
Thanks
matt
Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
Neil Citro
2018 Reflection 28BH Pepwave
2019 F350 6.7L Long Bed Crew Cab
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Originally posted by mattbfarmer View PostWhere is the vacuum break / air gap located on at 2021 Reflection 28BH?
Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
2017 Ford F-350 DRW, '19 315RLTSPlus
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