Thread Tools Display Modes
Old 11-08-2010, 06:23 PM   #1
Junior Member
Join Date: Nov 2010
Posts: 1
black water tank flushing- help needed

As we travel from Canada to south Texas for the winter months, we've run into an issue that my Forest River dealer can't seem to resolve. When we arrived in Memphis yesterday I attempted to flush and drain the black water tank on our 2008 Cardinal. Everything worked fine when I did the same procedure three days earlier. I attached the fresh water flush hose to its female end, turned on the water and got nothing! The hose was fine, there was lots of water pressure. Somewhere between the female coupler outside the tank and the spray wand inside the black water tank, the pressure died, and no water was getting into the tank. Has anyone else seen this problem?, is there a solution?, do I need a dealer to fix it? where would one begin attempting to fix it? To be clear, I've checked the screen, felt cautiously in the line (about 1 foot) for any obstuction and found nothing. I haven't tried these forums before but I'm optimistic that someone out there knows the solution to my problem.

Ronfredericton is offline   Reply With Quote
Old 11-08-2010, 07:47 PM   #2
Site Team - Lou
Herk7769's Avatar
Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,376
The white hose on the right tank is the turbo flush line from the female fitting on the outside wall to the tank.

There might be a kink in the white hose, but if it worked before, that can't be it. Not much else it could be though. There is a check valve under the vanity (in my camper) that might be broken.


Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
Herk7769 is offline   Reply With Quote
Old 11-09-2010, 06:07 AM   #3
Senior Member
cardinal4fun's Avatar
Join Date: Sep 2008
Location: Eastern Iowa
Posts: 314
If I remember correctly there is a check valve somewhere between the female connection and the connection to the tank. This check valve may have gone bad.

You might also try asking the folks a CARDINAL RV CLUB
3500 Ram 5.9l diesel
08 35 RLT Cardinal
5th Airborne Pin Box
cardinal4fun is offline   Reply With Quote
Old 11-09-2010, 06:39 AM   #4
Senior Member
realebill's Avatar
Join Date: Jul 2008
Location: baltimore,md
Posts: 363
as dumb as it sounds...this is what i encountered not with my trailer,but with flushing my boat motor. hooked up the clamshell and put it on the boat motor and turned on the hose.....nothing,no water at all. took the clamshell off the hose and the hose worked fine. looked inside the flusher and it was filled with small pieces of green leaves which had totally clogged it up. this has happened before with the hose nozzle. seems some small insect is carrying the leaves inside the hose.when pressure is applied the leaves clog at the smallest opening i now connect the male/female ends together when its hanging outside.
realebill is offline   Reply With Quote

black water

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

» Featured Campgrounds

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

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 05:29 PM.