 |
|
|
|
ken56
Tennessee
Senior Member
Joined: 01/12/2013
View Profile
Good Sam RV Club Member
 Offline
|
If your black tank has a tank flush on it, if you leave that run by mistake yes, it will overfill and will come out the vent pipe on the roof. All tanks have a vent of some type so they will drain. Be very careful you are not distracted when you use the black tank flush and forget to shut it off.
|
swimmer_spe
Sudbury, Ontario, Canada
Senior Member
Joined: 08/14/2013
View Profile
Offline
|
2112 wrote:My gray tank is full when the shower no longer drains.
My black tank is full when the toilet burps when I flush.
My gray fills up long before the black. I put a valve on the main drain pipe where you connect the drain hose. With that valve closed I open the gray valve, wait a few second, then open the black valve to move some gray water to the black tank. Then close both valves. That gets me at least another shower before to the dump we go.
Do you have a picture of that setup?
Both of mine go to one main drain with drain valves for both tanks.
|
wnjj
Cornelius, Oregon
Senior Member
Joined: 01/11/2007
View Profile
Offline
|
swimmer_spe wrote:2112 wrote:My gray tank is full when the shower no longer drains.
My black tank is full when the toilet burps when I flush.
My gray fills up long before the black. I put a valve on the main drain pipe where you connect the drain hose. With that valve closed I open the gray valve, wait a few second, then open the black valve to move some gray water to the black tank. Then close both valves. That gets me at least another shower before to the dump we go.
Do you have a picture of that setup?
Both of mine go to one main drain with drain valves for both tanks.
You can do this trick by just leaving the cap on the end but you will have to deal with the “extras” when you pull the cap to connect the hose at the dump.
|
swimmer_spe
Sudbury, Ontario, Canada
Senior Member
Joined: 08/14/2013
View Profile
Offline
|
wnjj wrote:swimmer_spe wrote:2112 wrote:My gray tank is full when the shower no longer drains.
My black tank is full when the toilet burps when I flush.
My gray fills up long before the black. I put a valve on the main drain pipe where you connect the drain hose. With that valve closed I open the gray valve, wait a few second, then open the black valve to move some gray water to the black tank. Then close both valves. That gets me at least another shower before to the dump we go.
Do you have a picture of that setup?
Both of mine go to one main drain with drain valves for both tanks.
You can do this trick by just leaving the cap on the end but you will have to deal with the “extras” when you pull the cap to connect the hose at the dump.
Sounds nasty. Best left for times of desperation.
|
wnjj
Cornelius, Oregon
Senior Member
Joined: 01/11/2007
View Profile
Offline
|
Actually there is this add-on valve you can use. Then once your tanks are empty you can always remove it.
Amazon link
|
|
|
schlep1967
Harrisburg, PA
Senior Member
Joined: 12/08/2005
View Profile
Good Sam RV Club Member
|
wnjj wrote:swimmer_spe wrote:2112 wrote:My gray tank is full when the shower no longer drains.
My black tank is full when the toilet burps when I flush.
My gray fills up long before the black. I put a valve on the main drain pipe where you connect the drain hose. With that valve closed I open the gray valve, wait a few second, then open the black valve to move some gray water to the black tank. Then close both valves. That gets me at least another shower before to the dump we go.
Do you have a picture of that setup?
Both of mine go to one main drain with drain valves for both tanks.
You can do this trick by just leaving the cap on the end but you will have to deal with the “extras” when you pull the cap to connect the hose at the dump.
DO NOT TRY THIS WITH JUST THE CAP IN PLACE!!!
People really should think before they post this stuff. If you want to use this method get yourself one of the twist on valves for the end of your drain line. That way you can attach the hose before you let the c r a p fly.
2021 Chevy Silverado LTZ 3500 Diesel
2022 Montana Legacy 3931FB
Pull-Rite Super Glide 4500
|
swimmer_spe
Sudbury, Ontario, Canada
Senior Member
Joined: 08/14/2013
View Profile
Offline
|
schlep1967 wrote:wnjj wrote:swimmer_spe wrote:2112 wrote:My gray tank is full when the shower no longer drains.
My black tank is full when the toilet burps when I flush.
My gray fills up long before the black. I put a valve on the main drain pipe where you connect the drain hose. With that valve closed I open the gray valve, wait a few second, then open the black valve to move some gray water to the black tank. Then close both valves. That gets me at least another shower before to the dump we go.
Do you have a picture of that setup?
Both of mine go to one main drain with drain valves for both tanks.
You can do this trick by just leaving the cap on the end but you will have to deal with the “extras” when you pull the cap to connect the hose at the dump.
DO NOT TRY THIS WITH JUST THE CAP IN PLACE!!!
People really should think before they post this stuff. If you want to use this method get yourself one of the twist on valves for the end of your drain line. That way you can attach the hose before you let the c r a p fly.
That valve looks better than just letting it fly...
|
Lantley
Ellicott City, Maryland
Senior Member
Joined: 08/23/2005
View Profile
Offline
|
All you need is a twist on drain valve. Permanently attached it and get rid of drain cap altogether.
With valve closed and both tanks open tanks will equalize and you can allow black tank to fill with some excess grey water
![[image]](https://images-na.ssl-images-amazon.com/images/I/51O-0TtARCS._AC_UL232_SR232,232_.jpg)
19'Duramax w/hips,12'Open Range,Titan Disc Brake
BD3,RV safepower,22" Blackstone
Ox Bedsaver,RV760 w/BC20,Glow Steps, Enduraplas25,Pedego
BakFlip,RVLock,5500 Onan LP,Prog.50A surge,Hughes autoformer
Porta Bote 8.0 Nissan,Sailun S637
Correct Trax,Splendide
|
Cummins12V98
on the road
Senior Member
Joined: 06/03/2012
View Profile
Offline
|
ken56 wrote:If your black tank has a tank flush on it, if you leave that run by mistake yes, it will overfill and will come out the vent pipe on the roof. All tanks have a vent of some type so they will drain. Be very careful you are not distracted when you use the black tank flush and forget to shut it off.
I ALWAYS SET THE TIMER on my phone!!!!!!!!!!!
Distracted dumping can end up being a real SH!TTY experience. ![[emoticon]](http://www.rv.net/sharedcontent/cfb/images/biggrin.gif "biggrin")
2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"
"HeavyWeight" B&W RVK3600
2016 MobileSuites 39TKSB3 highly "Elited" In the stable
2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD
|
Grit dog
Black Diamond, WA
Senior Member
Joined: 05/06/2013
View Profile
Offline
|
Or short story is, if you overfull the black tank you have to be pretty dang unobservant, short of a toilet valve and flapper leak at the same time.
And if the gray gets full unexpectedly, unless you’re sardine camping, u can always water the lawn late at night….
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold
|
|
|
|
|
|
|
|
