action916

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

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

Im new to this forum and won't allow me to create a new post since I'm new. 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