Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
Jayco RV Owners Forum
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-15-2017, 03:26 AM   #1
Junior Member
 
Join Date: Oct 2015
Location: Detroit suburbs
Posts: 19
Black tank flush valve

So i have the dreaded black tank flush valve leak, and have a question.

has anyone bypassed it on the inside of the trailer and just used an back flow preventer on the inlet outside?

I figure it would be safer than replacing it and chancing another leaking one.
__________________
Chris

2015 Jay Flight 32TSBH
Fordguy5507 is offline   Reply With Quote
Old 05-15-2017, 07:22 AM   #2
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
Yes, what you said. Every valve I ever had leaked, in bad places. It's the first modification I do to all of them.
__________________
John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 05-15-2017, 08:59 AM   #3
Junior Member
 
Join Date: Oct 2015
Location: Detroit suburbs
Posts: 19
thanks john, were you able to just use a pex coupling or shark bite to eliminate it. or did have to redo some of the piping?
__________________
Chris

2015 Jay Flight 32TSBH
Fordguy5507 is offline   Reply With Quote
Old 05-15-2017, 12:24 PM   #4
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
Every rigs been different on the configuration, but most I just used a pex fitting and 2 pex crimps. The Jayco has pex from the inlet, then it's joined to flexible line (where the valve used to be).

One fifth wheel I removed about 6' of pex tubing due to the valves location. Another had it ran with 1/2" flexible hose, and had it mounted in a wall behind a tv. Dumb. Removed 6-8' of tubing out of that one.
__________________
John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 05-15-2017, 12:27 PM   #5
Senior Member
 
Join Date: May 2013
Location: Dale Hollow Lake Tn/Ky
Posts: 2,525
Had a nasty leak inside under the bathroom sink when I attempted to flush out the tank. It was at a camp site that had a sewer connection so I left it running for a few minutes. When I went inside there was water everywhere. Under the shower, out into the main room under the pantry and back into the bedroom. Spent a couple hours sooping it up and drying everything out. Couldn't tell exactly what happened and wasn't going to hook up the flush again just to prove that it was the valve that was leaking so I haven't use the flush since then.

Can you be a bit more specific on how to eliminate the valve altogether. Also what purpose does the valve serve? It is capped off outside so shouldn't be a concern about splash or venting from the tank.
Bassdogs is offline   Reply With Quote
Old 05-15-2017, 12:47 PM   #6
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
Here's a picture of where mine was and what it looks like now. Red box around it. The line used to go up in the wall behind the shower (you see the opening), this was pex, then on the outlet of the valve it was flexible line. I cut out some of the pex and flex line and joined the 2.

What's it for? To create a big PITA for us owners and strategically flood our rigs when least expected thus allowing either us to lose valuable time fixing it, or lose time because it's at the dealer getting repaired.

All BS aside, anti siphon valve. Kind of a one way street thing. When water flows into it, it closes the vent and allows water to go through the valve to the sprayer. When you shut the water off, the little piece inside drops, opening the vent. This allows the water on the tank side of the valve to go that way, and the water on the inlet side to go back out of the inlet. In other words, no cross contamination, or siphoning. By design / code or whatever, the valve has to be installed at toilet seat level or above. This is why you see them up high under a sink, run up in a wall etc.

Cut the crap out, use an inline valve on the inlet, use a designated hose, and you're done with possible leaks.
Attached Thumbnails
IMG_6004 - Copy.jpg  
__________________
John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 05-15-2017, 01:02 PM   #7
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
Hopefully this picture shows up worth a crap. Just for those that haven't seen one. They sometimes are clear, which would really "clear" things up as to how they work. Sometimes they're black and you can't see the guts. When the water comes on, the plunger goes up sealing the vent and water goes to the sprayer. When off, the plunger drops, vent opens, line drains to tank and prevents siphoning.

Problem is, 95% of the time, that plunger doesn't seal the vent, thus leaking water under your cabinet, or wherever else it may be installed.

If you've ever seen the anatomy of the flush system, the odds of siphoning going on is extremely slim. Not going to get in that argument again.
Attached Images
 
__________________
John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 05-15-2017, 01:16 PM   #8
Junior Member
 
Join Date: Oct 2015
Location: Detroit suburbs
Posts: 19
thanks john, big help.

it dawned on me that even if i replace it a brass one it can still leak if the seal goes bad.

ill be cutting it out next time i am out.

thanks again john.
__________________
Chris

2015 Jay Flight 32TSBH
Fordguy5507 is offline   Reply With Quote
Old 05-15-2017, 01:20 PM   #9
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
You're most certainly welcome. Glad I could help someone out today.
__________________
John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 05-15-2017, 04:10 PM   #10
Senior Member
 
Join Date: May 2013
Location: Dale Hollow Lake Tn/Ky
Posts: 2,525
Quote:
Originally Posted by BigJohnD View Post
Hopefully this picture shows up worth a crap. Just for those that haven't seen one. They sometimes are clear, which would really "clear" things up as to how they work. Sometimes they're black and you can't see the guts. When the water comes on, the plunger goes up sealing the vent and water goes to the sprayer. When off, the plunger drops, vent opens, line drains to tank and prevents siphoning.

Problem is, 95% of the time, that plunger doesn't seal the vent, thus leaking water under your cabinet, or wherever else it may be installed.

If you've ever seen the anatomy of the flush system, the odds of siphoning going on is extremely slim. Not going to get in that argument again.
I just took a peak under my very small bathroom vanity and the valve is high and is connected with screw on/off pex connectors. These are the same connectors used for the water pump that allows you to disconnect the pump input and output lines when replacing the pump. The good news is that this will make it easy to remove the valve but I will need a 90degree elbow with what ever type male ends that are needed. I could cut out a few inches of the pex running vertically in order to give me enough room to use a flexible hose to reconnect to the input connection coming thru the outside wall.

Any suggestions on the best way to do this?
Bassdogs is offline   Reply With Quote
Old 05-15-2017, 04:34 PM   #11
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
Anyway to post a picture of your set up?
__________________
John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 05-15-2017, 04:48 PM   #12
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
Not sure if you have any pex tools, but I've always cut those fittings off and gone with a straight or 90 deg pex fitting. Eliminates a few leak possibilities at those cheap fittings.
__________________
John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 05-15-2017, 07:16 PM   #13
Senior Member
 
Join Date: May 2013
Location: Dale Hollow Lake Tn/Ky
Posts: 2,525
Quote:
Originally Posted by BigJohnD View Post
Not sure if you have any pex tools, but I've always cut those fittings off and gone with a straight or 90 deg pex fitting. Eliminates a few leak possibilities at those cheap fittings.
Sorry no pics but can describe the set up. Pex comes straight from the input connection but only a couple inches, and then into the flush valve. The output comes off the valve generally in a downward direction. The valve, as in one of your pics, also functions as a 90degree. There is a screw on female connector on the end of both the input and the output that connects to the pex lines.

I know these screw on connectors fit on a standard faucet fixture but I don't think they come with a male on both ends. I do have a pex crimper but it is pretty large and ackward to use in a tight confined area. I learned that recently when I installed a new stainless sink on the kitchen island. Did I mention that I hate plumbing.
Bassdogs is offline   Reply With Quote
Old 05-15-2017, 07:46 PM   #14
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
They do in fact make that connector, it's just a matter of can you find one. 1/2" npt 90, male x male. I have 2 sets of pex crimpers; one rather big, the other small just for the rv cinch crimps. Here's a few fittings I was thinking of. It can be done for sure.
Attached Thumbnails
IMG_9064.JPG   IMG_9065.jpg  
BigJohnD is offline   Reply With Quote
Old 05-16-2017, 07:44 AM   #15
Senior Member
 
Join Date: May 2013
Location: Dale Hollow Lake Tn/Ky
Posts: 2,525
Quote:
Originally Posted by BigJohnD View Post
They do in fact make that connector, it's just a matter of can you find one. 1/2" npt 90, male x male. I have 2 sets of pex crimpers; one rather big, the other small just for the rv cinch crimps. Here's a few fittings I was thinking of. It can be done for sure.
Thanks. Found one of the 90's on Amazon 7.99. Thinking now I may try to cut out and splice in a longer pex tube with a 1/2" male npt to pex that would allow me to reach the screw on female connector coming off the oem input line. Would have to splice in a longer piece because the existing line that currently connects to the bottom of the flush valve won't reach the input line after I eliminate the valve.

Not in a hurry to do this so have the time to ponder for the easiest fix for a plumbing hater.
Bassdogs is offline   Reply With Quote
Old 05-17-2017, 01:50 PM   #16
Senior Member
 
WyEm's Avatar
 
Join Date: Dec 2015
Location: Beaverton, Oregon
Posts: 174
I think this is what he describes. Its the factory setup on my 2016 Whitehawk 27DSRL:
Attached Thumbnails
vacuum breaker valve.jpg  
__________________
2016 Jayco Whitehawk 27DSRL
2010 Ford F-150 XLT Supercrew with Max Tow
WyEm is offline   Reply With Quote
Old 08-25-2017, 10:38 AM   #17
Member
 
Join Date: Sep 2014
Location: Topeka
Posts: 35
I'm going to give it a second shot, mine is leaking now so I wrote B&B they sent this back:

Quote:
Thank you for contacting B&B Molders. We apologize for any inconvenience this mishap may have caused. It is our pleasure to send you a replacement part at no charge.


We will also include a self addressed, stamped envelope for your convenience to return the original part. It is important to us that our Engineering Department analyze parts ensuring we manufacture to our high quality expectations.


Please do not hesitate to be back in touch should you need further assistance. Thank you again.
So I'll install the new one and keep an eye on it.
__________________
Matthew...
2014 Jayco Jay Flight 19RD
Ford F-150 Triton V8 4.6L
dj-matt is offline   Reply With Quote
Old 08-25-2017, 04:10 PM   #18
Senior Member
 
BigJohnD's Avatar
 
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
Have someone at the valve when you turn the water on. It'll fail again, just a matter of when.
__________________
John and Rebecca Dickson
Emma-13 / Little John-10 / Iva-7
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)
BigJohnD is offline   Reply With Quote
Old 08-26-2017, 07:12 AM   #19
Senior Member
 
Join Date: Jun 2012
Location: West Chicago
Posts: 550
Certainly a change I will explore, appreciate the advice before I have any trouble.
__________________
2019 F250, gas, 4.30
2017 29RKS
wabirch is offline   Reply With Quote
Old 08-28-2017, 08:53 AM   #20
Senior Member
 
Atlee's Avatar
 
Join Date: Jun 2016
Location: Mechanicsville
Posts: 1,479
My black water flush set up is not like that at all no my 23RB.

With mine, I have the inlet on the outside of the trailer, where the hose screws into the inlet. It goes through the wall, then there is a 90 degree elbow. The water line then goes down close to the floor where there is another 90 degree elbow. The water pipe then runs horizontal to the floor where these is another 90 degree elbow. From here the water line disappears through the floor and presumable connects to the black tank.

I have seen a cut off valve anywhere.

Quote:
Originally Posted by WyEm View Post
I think this is what he describes. Its the factory setup on my 2016 Whitehawk 27DSRL:
__________________
Erroll and Mary Doss and Duffy (RIP)
2018 Jayco Redhawk 22J

2014 F150 SC, 4x4, HD Pkg, Sterling Gray
Atlee is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

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


All times are GMT -6. The time now is 12:31 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright 2002-2016 Social Knowledge, LLC All Rights Reserved.