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Topic: Leak under KItchen counter (Read 922 times) previous topic - next topic

Leak under KItchen counter

Have a small dripping leak behind the draws under the stove.  There is a pipe coming from the rear and turning 90 degrees up to near the counter then there is what seems to be an air vent then going back down  to another pipe returning to the rear,  This air vent is dripping from the top.  Took it out and replaced iy with a new one and it is also dripping.  Drip is definitely coming from the top and not from the connections.
Does anyone know what this is for.  Thinking of bypassing it??????  Will it affect anything
currently coachless
2003 U320 40ft
Build # 6200
Toad  2014 SRX

Re: Leak under KItchen counter

Reply #1 –
Photo?

ETA if by "air vent" you're referring to an air admittance valve, dripping from the top might mean the pipe is full of grey water/not draining properly.  You don't want to bypass an air admittance valve.
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Leak under KItchen counter

Reply #2 –
See black thing at top
currently coachless
2003 U320 40ft
Build # 6200
Toad  2014 SRX

Re: Leak under KItchen counter

Reply #3 –
The air admittance for the gray tank is behind these pipes
currently coachless
2003 U320 40ft
Build # 6200
Toad  2014 SRX

Re: Leak under KItchen counter

Reply #4 –
Looks like this is a kind of backflow preventer. Can you remove it and take it apart as diapraghm may be the problem??
JohnH
Coachless, now use aircraft. 2003 Ford Travelair TC280 class C. Super shape. Just for 1 yr .
1994 Ford E350 ClassC,total renovation inside and out. Now sold.
2000 U295  36' Cummins 350 c/w Banks Stinger, Resonator upgrade,Solar, LED lites.Residential fridge with slide out pantry. Build 5674. Sold
ex 92 GV 022C ored Cummins. Sold
ex 95 GV240 cat 3116. Sold
2017 Mini cooper s & 2016 land Rover LR2 HSE  LUX.
jhaygarth@aol.com    SKP #130098
treat everyone as you would like to be.

Re: Leak under KItchen counter

Reply #5 –
if its the air admittance valve they are 5$ at the hardware store and screw on .. As easy as Miyagi wax on wax off principle.

Re: Leak under KItchen counter

Reply #6 –
Looks more like the leaking water is running down the white water hoses.  The square thing in photo looks kinda like the device in this link:

JR Products 571-VAC-CHK-A RV Vacuum Breaker/Check Valve - Walmart.com
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Leak under KItchen counter

Reply #7 –
Found some threads on other forums complaining of leaks from these devices.  Here is one sample:

Black Tank Flush Check Valve - B & B Molders Model 571 - iRV2 Forums
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Leak under KItchen counter

Reply #8 –
Looks like it is normally associated with a holding tank flushing system.  Seems to be a common source of trouble, and often removed:

293SBH Black Tanks Flush - Check Valve backwards - Keystone RV Forums
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Leak under KItchen counter

Reply #9 –
Valve upstream of vacuum breaker must not be sealing all the way, check or replace valve upstream first
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: Leak under KItchen counter ***resolved****

Reply #10 –
Thanks to all the replies here we did resolve the problem.  It is in fact part of the black tank flush system. I had a short hose continuously  connected from the outside faucet to the flush system.  So I ran the flush and we could feel water running thru the lines and the leak stopped.  After this test I disconnected the hose and a significant amount of water came out of the connection.  There now is no water in those lines in the picture and the leak stopped.
My conclusion is that having the small hose connected all the time  was the cause .

Thanks again to all that replied and especially the pictures which were exactly like what I have.  Who would have thought that something from the black tank would be way up under the kitchen counter??????
currently coachless
2003 U320 40ft
Build # 6200
Toad  2014 SRX

Re: Leak under KItchen counter

Reply #11 –
That style of vacuum breaker has to be elevated to function properly, and they can an do spit water if for some reason the downstream pressure is higher than upstream pressure.
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: Leak under KItchen counter

Reply #12 –
Quote from: Vectra930 –
Thanks to all the replies here we did resolve the problem.  It is in fact part of the black tank flush system. I had a short hose continuously  connected from the outside faucet to the flush system. 

My conclusion is that having the small hose connected all the time  was the cause .

Curious - do you have an aftermarket switch-operated black tank flush or were you using a Y-connector on the shore water?  Normally one doesn't leave the tank flush hooked up, especially with the black valve closed, because you do risk filling the black tank...
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Leak under KItchen counter

Reply #13 –
I was using a 4 foot white hose connected to the faucet in the wet bay.  The hose was attached to the built in black tank spray connection.  I have not used the faucet for anything else so  just left the hose connected.  I guess if the faucet got accidentally partially open I would have filled the black tank.  Anyway after this leak experience I will no longer leave it connected.  This just proves the old adage that you are never to old to learn.

Again I want to thank every one who helped me.
I have had this complex coach less than a year.    This site is assume.
 
currently coachless
2003 U320 40ft
Build # 6200
Toad  2014 SRX
 

Re: Leak under KItchen counter

Reply #14 –
Those vents aren't for the tank but the trap associated with whatever sink the pipe comes from. The roof vent is for venting the tank.
Larry
1996 U295 36'
Build # 4805
Actually we sold it but just like to lurk