Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
Old 03-20-2020, 01:56 PM   #1
Junior Member
 
Join Date: Apr 2019
Posts: 22
Black tank flush issues

I own a 2020 Grey Wolf 29BH. I have tried to use the black tank flush four times now, and it has never worked. I thought it may be the the vacuum breaker, so I removed it and put in a straight male to male coupling. Nothing. I did find out that I have a leak from the exterior connection into the camper, though. Anyone know a part number or where to get a replacement? Is anyone else having issues? What did you check/ replace. Enclosed underbelly, so I canít easily check the connection to the black tank.
__________________
2020 Grey Wolf 29BH
2015 Ford Expedition EL Platinum
RetNavy is offline   Reply With Quote
Old 03-20-2020, 02:31 PM   #2
Senior Member
 
brookstone345sa's Avatar
 
Join Date: Oct 2014
Location: Wilmington, De
Posts: 239
That leak could indicate that line from hose connection to tank is crimped. If possible I would check that first. Second would be air admittance valve, sometimes they are installed wrong
brookstone345sa is offline   Reply With Quote
Old 03-20-2020, 02:53 PM   #3
Senior Member
 
brookstone345sa's Avatar
 
Join Date: Oct 2014
Location: Wilmington, De
Posts: 239
Air admittance valve/ could be under bath or kitchen sink
Attached Images
 
brookstone345sa is offline   Reply With Quote
Old 03-20-2020, 03:36 PM   #4
2014 XLR 27HFS
 
dave961's Avatar
 
Join Date: Apr 2014
Location: Clearwater, FL
Posts: 452
I had a similar issue when I bought ours. I too thought it was the backflush valve. I took that apart and put it together, tested fine. Next I traced the line from the side of the trailer and found the factory had zip tied a 180 degree crimp in the line. Even after removing that tie, it took some work to loosen the crimp in the line. It's worked great since then.
Attached Thumbnails
Click image for larger version

Name:	Valve.jpg
Views:	87
Size:	390.8 KB
ID:	225463   Click image for larger version

Name:	Before.jpg
Views:	78
Size:	220.6 KB
ID:	225464   Click image for larger version

Name:	After.jpg
Views:	73
Size:	230.2 KB
ID:	225465  
__________________
Dave & Audrey
dave961 is offline   Reply With Quote
Old 03-21-2020, 11:43 AM   #5
Junior Member
 
Join Date: Apr 2019
Posts: 22
Thank you

Thank you for mentioning the kinked hose. I pulled down the undercarriage enclosure, and sure enough it was kinked. Now to figure out how to fix it. I moved the hose to a somewhat straighter run position, but the hose is collapsed in the area it was kinked. I’ll probably get a new section of hose and splice it in. Thanks again for everyone’s comments. I appreciate it.
RetNavy is offline   Reply With Quote
Old 03-21-2020, 11:50 AM   #6
Site Team
 
Mr. Dan's Avatar
 
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 16,804
Quote:
Originally Posted by brookstone345sa View Post
Air admittance valve/ could be under bath or kitchen sink
I can't see how the air admittance valve under either sink would have any effect on the black tank and its flush. An air admittance valve under either sink affects that sink's gray tank, not the black. Right?
__________________
FR Wildcat 295RSX / GMC Sierra

Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 42; Booked = 36
Mr. Dan is online now   Reply With Quote
Old 03-21-2020, 11:53 AM   #7
Senior Member
 
Join Date: Jul 2017
Location: North of Seattle, WA
Posts: 12,045
Quote:
Originally Posted by RetNavy View Post
Thank you for mentioning the linked hose. I pulled down the undercarriage enclosure, and sure enough it was linked. Now to figure out how to fix it. I moved the hose to a somewhat straighter run position, but the hose is collapsed in the area it was linked. Iíll probably get a new section of hose and splice it in. Thanks again for everyoneís comments. I appreciate it.
Sometimes a little heat from a hair dryer at the kink and some squeezing at the wide spots of the kink can help re-shape the hose so no further intervention is needed.

I would use a hair dryer rather than heat gun as heat guns can often get hot enough to melt "plastic" items and most hoses and piping (PEX) are just various types of "plastic".

Most lines that are kinked, and re-routed will eventually straighten out if they are under pressure constantly. The flush line only has pressure in it when used so it needs a little help.

Heating/reshaping is often easier than replacing.
__________________
"A wise man can change his mind. A fool never will."

"You only grow old when you run out of new things to do"

2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan
TitanMike is online now   Reply With Quote
Old 03-21-2020, 12:24 PM   #8
Member
 
Join Date: Dec 2018
Posts: 39
You can use a short length of PVC pipe as a "splint" if you split it lengthwise first.
Paul Dershem is offline   Reply With Quote
Old 03-21-2020, 12:30 PM   #9
Senior Member
 
Join Date: Jan 2013
Posts: 191
Smile Kinked hose

Quote:
Originally Posted by RetNavy View Post
Thank you for mentioning the kinked hose. I pulled down the undercarriage enclosure, and sure enough it was kinked. Now to figure out how to fix it. I moved the hose to a somewhat straighter run position, but the hose is collapsed in the area it was kinked. Iíll probably get a new section of hose and splice it in. Thanks again for everyoneís comments. I appreciate it.

Just take an adjustable radiator clamp, put it around the kink and slowly tighten until kink disappears. Has worked for me several times.
__________________
VMI'62
Edmund is offline   Reply With Quote
Old 03-21-2020, 12:39 PM   #10
2014 XLR 27HFS
 
dave961's Avatar
 
Join Date: Apr 2014
Location: Clearwater, FL
Posts: 452
Quote:
Originally Posted by RetNavy View Post
Thank you for mentioning the kinked hose. I pulled down the undercarriage enclosure, and sure enough it was kinked. Now to figure out how to fix it. I moved the hose to a somewhat straighter run position, but the hose is collapsed in the area it was kinked. Iíll probably get a new section of hose and splice it in. Thanks again for everyoneís comments. I appreciate it.
To get the kink out of mine, I forced it round with vice grips and left it like that a few days. Still wanted to collapse a bit, so (not sure you can see it in the picture) I put a fat zip tie around it. I wanted to use a hose clamp like someone mentioned, but I would have had to remove one end - then deal with re-attaching it. I like the hair dryer idea.
__________________
Dave & Audrey
dave961 is offline   Reply With Quote
Old 03-21-2020, 12:47 PM   #11
Senior Member
 
bubbles's Avatar
 
Join Date: Dec 2012
Posts: 5,729
Quote:
Originally Posted by brookstone345sa View Post
That leak could indicate that line from hose connection to tank is crimped. If possible I would check that first. Second would be air admittance valve, sometimes they are installed wrong
This post should never have been part of this thread.
bubbles is offline   Reply With Quote
Old 03-21-2020, 01:12 PM   #12
Senior Member
 
Adrian Gordon's Avatar
 
Join Date: Mar 2018
Posts: 396
Quote:
Originally Posted by Mr. Dan View Post
I can't see how the air admittance valve under either sink would have any effect on the black tank and its flush. An air admittance valve under either sink affects that sink's gray tank, not the black. Right?
Thanks. I thought maybe my whole understanding of my plumbing system was crazy.
__________________
2018 Coachmen Leprachaun 210RS with DW, Nanuq the Samoyd puppy and the cat.
Adrian Gordon is offline   Reply With Quote
Old 03-21-2020, 02:09 PM   #13
Member
 
Join Date: Jan 2016
Posts: 69
Listen to Edmund

Use a hair dryer or heat gun to soften the kink, then apply an appropriately-sized plastic pipe clamp (or two) from the hardware store (or radiator hose clamps from the auto parts store) to bring it slowly back to round, heating again as you work if necessary. Leave the clamp(s) in place permanently as long as they aren't rubbing against something they'd hurt. This method offers a lifetime fix, bringing the hose back to full diameter without having to cut, splice, or anything else your original hose.
GFD47 is offline   Reply With Quote
Old 03-21-2020, 02:44 PM   #14
Senior Member
 
Join Date: Jun 2011
Posts: 231
Quote:
Originally Posted by brookstone345sa View Post
Air admittance valve/ could be under bath or kitchen sink
Not sure how thatís related to a BW flush. That goes to grey water tank.
JP Camper is offline   Reply With Quote
Old 03-21-2020, 02:47 PM   #15
Senior Member
 
NMWildcat's Avatar
 
Join Date: Jun 2012
Location: Southern NM
Posts: 6,905
I did have a pex line crimp after installing our Shower Miser. It crimped due to too much tension going around a corner and the high heat of summer.
My solution was to cut out the crimp and install a 45į shark byte fitting. No more problems.
__________________
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
Old 03-21-2020, 03:27 PM   #16
Pickin', Campin', Mason
 
5picker's Avatar
 
Join Date: Aug 2015
Location: South Western PA
Posts: 14,353
Quote:
Originally Posted by Edmund View Post
Just take an adjustable radiator clamp, put it around the kink and slowly tighten until kink disappears. Has worked for me several times.
That has worked for me several times too.

Also 4 or 5 zip ties next to each other wrapped around the kink and pulled as tight as the diameter of the hose often straightens the kink out.
__________________
_________________________________________
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel-Goodyear Endurance Tires
2017 Ford F-Series SCREW 4x4 - Factory Puck B&W Companion
TST Tire Monitor w/Repeater - Sinemate 3500w Gen.

Days Camped: '18=51 '19=58 '20=110 '21=94
5picker is offline   Reply With Quote
Old 03-21-2020, 04:14 PM   #17
Senior Member
 
Join Date: Apr 2016
Location: Port Charlotte Fl/Hinsdale Ma
Posts: 4,823
Quote:
Originally Posted by JP Camper View Post
Not sure how thatís related to a BW flush. That goes to grey water tank.
It does not relate. That info came from someone how does understand plumbing. Water lines and drain lines are nit connected.
cavie is offline   Reply With Quote
Old 03-22-2020, 09:02 PM   #18
Member
 
Join Date: Mar 2020
Posts: 46
i can't provide any fix for ya but i can tell you that in our new 23DBH, we too are leaking between the fitting and the interior plumbing (i.e. inside the wall).

i'm just having the dealer fix under warranty. they're fighting with forest river now regarding the repair time required (who said 20 minutes while dealer says much longer... whatever, between them i guess). i'm supposed to check back in with them in a week.
OR_Brewer is offline   Reply With Quote
Reply

Tags
black, black tank, black tank flush, flush, tank

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

Disclaimer:

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



All times are GMT -5. The time now is 07:15 PM.