GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.
Home » Public Forums » GMCnet » Need plumbing advice, please?
Re: [GMCnet] Need plumbing advice, please? [message #328520 is a reply to message #328518] Mon, 22 January 2018 20:11 Go to previous messageGo to previous message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma:
Senior Member
Most of the Royale GMC'S I have worked on with two tanks, use the kitchen
sink draining into the Greywater tank, and the lavatory sink, shower, and
toilet draining into the blackwater tank. The two tanks have separate drain
valves, whose drain pipes join downstream from the valve. Without some
errors in plumbing, I don't see how water poured into the kitchen sink
would wind up in the shower drain, which dumps directly into the black tank
after the p or j trap.
Jim Hupy

On Jan 22, 2018 5:47 PM, "Ken Henderson" wrote:

> Justin, et al,
>
> I don't see how venting can possibly be the problem. To run into the
> shower pan, there MUST be liquid up to that level. H20 being a bit heavier
> than air, even if the tank had no vent (which it apparently now has two of,
> the original and the newly added one), the water would STILL go to the
> bottom of the tank, not up into the shower. Admittedly increased pressure
> in the tank MIGHT force a little bit, maybe a cup full, of water out of the
> P-trap, but no more.
>
> Ken H.
>
>
>
> On Mon, Jan 22, 2018 at 7:46 PM, Justin Brady wrote:
>
>> My guess is tank venting as well.
>> The water displaces the air in the tank, if the air can't escape the
> water
>> can't get in.
>>
>> Most tanks have at least one vent straight to atmosphere through the
> roof.
>> Not sure of the grey setup on your coach though as I don't have a grey
>> tank!
>> --
>> Justin Brady
>> http://www.thegmcrv.com/
>> 1976 Palm Beach 455
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: [GMCnet] FITECH Mystery solved
Next Topic: Bullitthead re bath door repair
Goto Forum:
  


Current Time: Tue May 07 05:26:12 CDT 2024

Total time taken to generate the page: 0.01299 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.1.
Copyright ©2001-2021 FUDforum Bulletin Board Software