Thread Tools Display Modes
Old 01-30-2011, 01:05 PM   #1
Junior Member
Join Date: Jan 2011
Location: wichita
Posts: 4
Sandpiper 356RL black tank flush... need help.

Hello! I recently purchased a 2011 sandpiper 356RL. And boy and I (one of many) am disappointed in the owners manual.

Anyways, on my last 5th wheel my black tank flush just hooked up and flushed the tank. On this when I hooked up the hose to the flush and turned it on, it acted weird and then when I ran inside to check on it, it was leaking under the sink. Is there something I need to do? There is a black component on the hose under the sink but i don't know the purpose of it.

Anyone have a clue? Need more info? Let me know!

Thanks a bunch!

J. Nelsen

jnelsen is offline   Reply With Quote
Old 01-30-2011, 08:42 PM   #2
Moderator Emeritus
Dave_Monica's Avatar
Join Date: Sep 2007
Location: Ontario, Canada
Posts: 4,329
There should be a back-flow protector on the flush line. You should check to see that it wasn't installed backwards (I'm assuming that the flush line runs through your bathroom vanity).



Nights camped in 2013 - 55, 2014 - 105, 2015 - 63
Dave_Monica is offline   Reply With Quote
Old 02-10-2011, 11:52 AM   #3
Junior Member
Join Date: Jan 2011
Location: wichita
Posts: 4
Thank you very much for your reply. Before I switch that around and try it again, do you know if there is a pressure valve or anything like that? Would too much pressure cause it to "blow-back"? I was thinking of this because if the spay nozzle inside the tank can't handle 40 psi of water pressure then the back flow valve would run over every time. Do you know of any thing like this that would affect it?
jnelsen is offline   Reply With Quote
Old 02-10-2011, 11:59 AM   #4
Moderator Emeritus
Join Date: Nov 2008
Location: Winston-Salem, NC
Posts: 2,381
Even if the back flow valve were installed backwards, it should not leak. A back flow valve is a fancy name for a check valve. It only lets flow travel one direction. If the flow tries to reverse, it closes and prevents this. Regardless of direction, it should not leak. Only way to find this is hook up the hose, ease the water on, then go inside with a flashlight and see what is leaking. Good luck.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic

2008 Work and Play 18LT
LadyWindrider is offline   Reply With Quote
Old 02-10-2011, 12:07 PM   #5
Junior Member
Join Date: Jan 2011
Location: wichita
Posts: 4
Okay, Thanks. If the valve leaks at all then it will need to be replaced then I take it.
jnelsen is offline   Reply With Quote
Old 02-10-2011, 12:46 PM   #6
Junior Member
Kmair1's Avatar
Join Date: Jul 2010
Location: Kelowna BC
Posts: 9
The black flush on my 2608SS leaked the first time I tried it. Sorry I don't know the cause, I just headed back to the dealer and had him fix it.


2011 Rockwood 2608SS
2006 Infiniti QX56
Kenny, Annie, and Brock (The Labradoodle)
2006 Rockwood 2602 (Gone)
2004 VW Touareg (Gone)
Kmair1 is offline   Reply With Quote

black tank, black tank flush

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Virginia Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 03:54 PM.