Thread Tools Display Modes
Old 08-10-2015, 08:48 PM   #1
Junior Member
Join Date: Aug 2012
Posts: 8
3170DS - Where does sewer flush line enter black water tank?

3170DS - Sewer flush doesn't work anymore. Appears to be clogged. Previously has worked for years. Problem is not with the anti-siphon valve (removed it two years ago when it broke). Tried tracing sewer flush line but it goes inside bathroom cabinet, then under the sink, then it appears to continue on past sink disappearing as it heads towards the underside of the tub. Tried compressed air, but I stopped at about 80psi feeling lucky that hose still held. Clog still there. Were do I find where the sewer flush line connects to the black water tank and where do I access this connection from? Thanks in advance.

BuickGS is offline   Reply With Quote
Old 08-14-2015, 09:03 PM   #2
Senior Member
Join Date: Feb 2012
Posts: 952
flusher connects to the passenger side end of the tank. You should be able to see it at the top of the storage compartment behind the rear wheels. Later years there may be a cover over the tank but on my 2012 3120 it's readily visible.

ATVer is offline   Reply With Quote
Old 08-15-2015, 12:40 PM   #3
Junior Member
Join Date: Aug 2012
Posts: 8
I finally found where I think the flush line enters the black water tank on my 3170DS. It appears that it enters at the top of the black water tank by going in under the wood partition that separates the undersink cabinet from the cabinet to the left of the undersink cabinet in the bathroom, behind some removable wood trim and some not so easily removable wood trim at the back of both cabinets, underneath a pvc drain pipe, electrical lines, and hot & cold water feed lines for the bathroom sink/tub that run horizontally along the floor at the back of the cabinets behind the wood trim. The fitting does not appear to be accessible without removing the bathroom sink cabinet or cutting a large hole in the partition to the cabinet, cutting out the drain pipe that runs along the wall and moving the electric and water lines out of the way, then I might get a glimpse of the fitting.

That's why I wanted to know if the fitting was actually there before I went and removed all of these things to try to gain access to the fitting to remove and clear the blockage.

I guess it doesn't matter now since I again connected an airline at 60 psi to the black tank flush line and this time it blew out whatever has been clogging this line for the past few months.
BuickGS is offline   Reply With Quote

3170, black, black water, tank, water, water 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

» 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 03:29 PM.