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03-07-2017, 06:23 PM
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#1
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Senior Member
Join Date: Apr 2013
Location: Up and down the east coast
Posts: 2,351
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Isata 3 Black tank flush
We have a 2017 and I am having trouble with the black tank flush. Hook the hose up, turn the water on and nothing. When I turn the water off and remove the hose a blast of air comes out. I fished around through the opening but nothing blocking it there.
I think it might be on the other end and I really don't want to remove the business end of the flush line. Anybody have any ideas?
__________________
2020 S.O.B.
2016 Jeep Wrangler 75th and a
Cooler full of good ideas
Full Time in the Summer, soon
Part Time in the Winter
Days Camped, Not Enough
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03-07-2017, 07:06 PM
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#2
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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when you hook up the flush hose is the black tank dump valve open?
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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03-07-2017, 07:07 PM
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#3
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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Before you take things apart get some strong tank cleaner there may be matter dried on the nozzle end of the flush and the tank cleaner may remove it. just a thought.
__________________
Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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03-07-2017, 08:16 PM
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#4
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Senior Member
Join Date: Apr 2013
Location: Up and down the east coast
Posts: 2,351
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Yes, the tank was open. I thought there may be something stuck but it's been like that since day one.
__________________
2020 S.O.B.
2016 Jeep Wrangler 75th and a
Cooler full of good ideas
Full Time in the Summer, soon
Part Time in the Winter
Days Camped, Not Enough
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03-08-2017, 10:12 AM
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#5
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Commercial Member
Join Date: Nov 2007
Location: Bristol, IN
Posts: 19,005
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If its an FW, the check valve is installed backwards. It's only that stupid floor plan (sorry). When they run the lines, the feed over from under the floor. When they rough plumb that, they stub up the two lines. Well, I don't think they mean to, but one is longer than the other by chance...when someone then installs the check valve those stub line lengths fit the valve. So instead of checking which line is which and cutting as needed, they use the taller one as the outlet...when it may in fact be coming from the outside connection.
Swap the two lines and you're in business. Problem is they are crimped connections.
So you could just cut the line and installed barbed fittings...but cut them opposite lengths of what they are now. (if you are looking to save a dealer trip).
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03-08-2017, 10:20 AM
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#6
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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That kind of info is what makes this site great!
__________________
Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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03-08-2017, 03:35 PM
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#7
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Senior Member
Join Date: Jul 2016
Posts: 1,520
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I agree. I don't think anyone wants to make a dealer trip if they don't have
too. I know I don't.  
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Joe & Debbie
2017 Dynamax DX3 37BH
Toad: 2020 Ford F-150
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03-08-2017, 08:54 PM
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#8
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Senior Member
Join Date: Apr 2013
Location: Up and down the east coast
Posts: 2,351
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Thanks Brian, I was counting on you to see my post. I'll take a look at it and see what it looks like. I'm guessing the connections are under the bed, right?
__________________
2020 S.O.B.
2016 Jeep Wrangler 75th and a
Cooler full of good ideas
Full Time in the Summer, soon
Part Time in the Winter
Days Camped, Not Enough
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03-08-2017, 09:06 PM
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#9
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Senior Member
Join Date: Apr 2013
Location: Up and down the east coast
Posts: 2,351
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Correcting n, it's under the bedside table, right?
__________________
2020 S.O.B.
2016 Jeep Wrangler 75th and a
Cooler full of good ideas
Full Time in the Summer, soon
Part Time in the Winter
Days Camped, Not Enough
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03-08-2017, 09:15 PM
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#10
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Commercial Member
Join Date: Nov 2007
Location: Bristol, IN
Posts: 19,005
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Lav base
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03-09-2017, 07:05 AM
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#11
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Senior Member
Join Date: Apr 2013
Location: Up and down the east coast
Posts: 2,351
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Ok, great. That makes it even easier. Thank you
__________________
2020 S.O.B.
2016 Jeep Wrangler 75th and a
Cooler full of good ideas
Full Time in the Summer, soon
Part Time in the Winter
Days Camped, Not Enough
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03-09-2017, 09:43 AM
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#12
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Senior Member
Join Date: Mar 2016
Posts: 2,990
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As far as dealing with the PEX withuot a crimper you might also want to check out the shark bite fittings. I haven't actually used any yet but through research they've gotten amazing reviews for their performance and simplicity. Fittings are more expensive but the tradeoff is not needing all the tools for crimping. I keep a couple for splicing handy in case I need them in a pinch.
SharkBite PEX Installation: How to Install PEX Tubing & More
Would need to figure the threads on the valve, but I think this would be your fitting
PVC x MNPT Male Adapters by SharkBite Plumbing Solutions
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2016 Dynamax DX3 - Big Blue
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03-09-2017, 09:49 AM
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#13
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Senior Member
Join Date: Jul 2016
Posts: 1,520
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Great info FOURWHL. I save that link, it will come in handy am sure.
thanks
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Joe & Debbie
2017 Dynamax DX3 37BH
Toad: 2020 Ford F-150
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03-09-2017, 09:50 AM
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#14
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Senior Member
Join Date: Feb 2013
Posts: 149
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Did this ever work, if so it is not the valve install backwards
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03-09-2017, 07:24 PM
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#15
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Commercial Member
Join Date: Nov 2007
Location: Bristol, IN
Posts: 19,005
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I think in his first post, he mentions that it has never worked.
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03-10-2017, 06:07 AM
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#16
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Senior Member
Join Date: Apr 2013
Location: Up and down the east coast
Posts: 2,351
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It never worked so most likely, it is installed backwards. I'm going to take it apart next month and check it out. I have a plumber friend that has a crisper, so I will have to schedule the fix around him.
__________________
2020 S.O.B.
2016 Jeep Wrangler 75th and a
Cooler full of good ideas
Full Time in the Summer, soon
Part Time in the Winter
Days Camped, Not Enough
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03-10-2017, 09:54 PM
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#17
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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Common problem, easy fix... it's reversed as suggested.
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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03-11-2017, 01:48 PM
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#18
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Having Fun
Join Date: Mar 2017
Location: Miami
Posts: 38
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Isata 3 black tank flush
Quote:
Originally Posted by CZNEDY
We have a 2017 and I am having trouble with the black tank flush. Hook the hose up, turn the water on and nothing. When I turn the water off and remove the hose a blast of air comes out. I fished around through the opening but nothing blocking it there.
I think it might be on the other end and I really don't want to remove the business end of the flush line. Anybody have any ideas?
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We just got ours early feb and that same problem along others were and are being resolved. We fixed our own black tank flush issue. It turns out they installed check valve backwards. Being handy I took the time to diagnose and fix vs taking to dealer and leaving there for God knows how long. In hindsight, we should have had dealer do the work, since it is there for other issues any ways.
Jose and Teresa
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07-14-2017, 10:51 PM
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#19
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Consumer of Space
Join Date: May 2017
Location: Huntington Beach, Ca
Posts: 285
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Is this only on the FW or can it happen to the BH? My tank flush wasn't working the first and only time I tried it. Is it under the vanity floor?
Thanks
__________________
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2018 Dynamax Force HD 37BH
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07-15-2017, 06:30 PM
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#20
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Commercial Member
Join Date: Nov 2007
Location: Bristol, IN
Posts: 19,005
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I'll have to check on that one. I've only ever seen the problem on the FW.
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