action916 Posted December 12, 2015 Share Posted December 12, 2015 I'm new to this forum: I have 1988 Toyota Tioga Motorhome. The problem is when I fill up the right compartment kitchen sink and drain it, water will burst up/ overflow in the rear bathroom sink. When I fill and drain water from the left compartment sink, this doesn't happen. How do I diagnosis the problem? I'm guessing the air vent that connects to the right side plumbing of the sink maybe clog? Not sure how to test this but thought maybe I can get some help before I start taking things apart. If there is a thread I can post this, please direct me. Thanks again!! Jay Quote Link to comment Share on other sites More sharing options...
5Toyota Posted December 12, 2015 Share Posted December 12, 2015 I think your sink and shower waste tank may be full. There should be 2 dump valves underneath the back end. The small one is for the sink water and if too full will back up in the shower. Hope this helps. Others will help. I would check that first. Quote Link to comment Share on other sites More sharing options...
Maineah Posted December 12, 2015 Share Posted December 12, 2015 If it's a double sink the drains are joined together under the sink so it should make no difference what sink you pour water in. It sounds like some one may have done some creative plumbing. Quote Link to comment Share on other sites More sharing options...
linda s Posted December 12, 2015 Share Posted December 12, 2015 What's a Toyota Tioga. Don't think I've ever seen one before seen though Tioga is a common brand. Love to see a picture of it Linda S Quote Link to comment Share on other sites More sharing options...
action916 Posted December 12, 2015 Author Share Posted December 12, 2015 Yes we drained the gray tank already and is completely empty. There maybe some creative plumbing so i might have to trace it. Wonder if there is a diagram to show proper plumbing assembly.I can post photos tomorrow of the Tioga Quote Link to comment Share on other sites More sharing options...
85mirage Posted December 17, 2015 Share Posted December 17, 2015 My kitchen sink empties into black tank. Bath sink and shower go into grey...i think Like previous said maybe black needs dumping. Quote Link to comment Share on other sites More sharing options...
snail powered Posted December 21, 2015 Share Posted December 21, 2015 Scroll down the page and read the section about gravity and slope of the drain lines. Of course if you are parked on a slope you can also induce a situation where the sink won't drain properly. http://www.rvdoctor.com/2001/01/recreation-vehicle-waste-management.html Quote Link to comment Share on other sites More sharing options...
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