Montana Owners Club - Keystone Montana 5th Wheel Forum - View Single Post - Grey water backs up, won't drain till black drain open

RichLP · 11-12-2018, 02:55 PM

Hi again all,

We've got a 2019 Montana 3731FL, and something seemingly odd is happening.

When we've taken a few showers, the shower drain stops draining, and water sits in the drainpan. BUT, when we pull the grey tank drain, the water doesn't drain out. Only after pulling the black tank drain does it go down. We even had it happen with the grey tank valve left open!

Any ideas why this might be happening?

Thanks in advance,

Rich

11-12-2018, 02:55 PM	#1
RichLP Established Member Join Date: Jun 2018 Location: Miami Posts: 11 M.O.C. #21932	Grey water backs up, won't drain till black drain open Hi again all, We've got a 2019 Montana 3731FL, and something seemingly odd is happening. When we've taken a few showers, the shower drain stops draining, and water sits in the drainpan. BUT, when we pull the grey tank drain, the water doesn't drain out. Only after pulling the black tank drain does it go down. We even had it happen with the grey tank valve left open! Any ideas why this might be happening? Thanks in advance, Rich