Thread Tools Display Modes
Old 10-07-2018, 08:57 PM   #1
Join Date: Aug 2011
Location: Northridge, CA
Posts: 39
Black tank valve won't open

Hi folks,
Cardinal 3350RL 5er, bought new in April 2018. Have loved it so far, but today leaving the RV park, I couldn't pull the black water valve open. Absolutely no give to it. Pulled as hard as I could; thought I would break it. The two grey valves work fine.

Any suggestions for what the problem may be and how I can repair this? I'm relatively handy, I don't mind cutting open the undercarriage, and I have a trip planned in two weeks.

Thanks for the suggestions everyone!

GilnJo is offline   Reply With Quote
Old 10-07-2018, 08:59 PM   #2
Senior Member
Join Date: Jul 2017
Location: Suffolk, Va.
Posts: 1,228
My valve is getting stiff on my 2018 Cedar Creek Champagne 38EL.

Michael & Fran Dilday (Baxter & Honey 2 Labs)
'18 Cedar Creek Champagne 38EL - '17 Ford F350 Lariat DRW w/Reese hitch - TST 507 Color TPMS - Garmin RV 770 LMT GPS
mwdilday is offline   Reply With Quote
Old 10-08-2018, 05:08 AM   #3
Senior Member
Join Date: May 2016
Location: Michigan
Posts: 209
Sounds like the cable is seized inside the sheath. I had this happen too. Did you by chance lubricate it with some sort of petroleum lube? If so, the sheath gets soft in reaction. Dealer fixed mine last time. Eventually I replaced all the cable pulls with Barker Auto Drain electric valve actuators.

2017 Cardinal 3850RL Mocha Pearl full body paint
2016 F350 Lariat 4x4 FX4 SRW CC SB 6.7 Magnetic Metallic
djousma is offline   Reply With Quote
Old 10-08-2018, 07:09 PM   #4
bigdaddy1's Avatar
Join Date: Jun 2008
Location: West Tennessee
Posts: 160
I have a 2019 3350RLX that we got this April but I have already begun to spray a small amount of silicone after I pull the valves and push in afterwards.
2015 F350 CC Lariat 4/4 SRW
6.7 diesel

2019 3350RLX
bigdaddy1 is offline   Reply With Quote
Old 10-09-2018, 04:56 PM   #5
Join Date: Jun 2017
Posts: 63
black Tank Valve

I am also an owner of a 3850 Cardinal and have experienced difficulty pulling all the valves.
Here is what I have done to fix the problem;
1.)Remove the access panel on the right of the basement. This will expose the cables.
2.) Remove the cables where they attach to the water manifold panel.
3.) Elevate the cable and squirt WD forty or lube of your choice down the end of the cable. You will need a can that has the straw adapter. Go slow and let it find its way down the cable, keeping it elevated. It may initially be too stuck to move the cable, but if you reattach it to the manifold box and try pulling it, the attaching will give you more leverage. Make sure to support with your hand around the cut out when pulling so you dont break the plastic housing. The cable should move a little. Repeat this process until you get the cable free. I also finished up by creating a guide for my cables by using wire ties to gather them, but dont tighten the wire ties. Just use them as a guide.
This will work just takes patience. If you have further question send me a message and we can discuss further.
Hope this helps
Changing it up a bit
2017 40 ft Cardinal Estate
2014 SRW Chev Duramax 3500
Titan 50 gal fuel tank
Air Lift 7500 lb bags
changing it up a bit is offline   Reply With Quote
Old 10-09-2018, 06:16 PM   #6
Senior Member
NMWildcat's Avatar
Join Date: Jun 2012
Location: Southern NM
Posts: 4,968
Had the same problem. My cables were longer than they needed to be so they coiled them and routing had some tight angles. Eventually froze and/or broke. Replaced them with correct length cables and routed them much straighter. Haven't had any more problems in the last five years.

Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder
NMWildcat is offline   Reply With Quote

black, black tank, tank, valve

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


This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 04:24 AM.