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cephoto's avatar
cephoto
Explorer
Sep 30, 2015

Gray tank won't drain

I'm a full time RVer. My kitchen(only) gray water tank is constantly open and draining. But recently I began to notice that the tank is registering 3/4 full. At first I thought bad guage but then while doing some dishes the water began to not drain from my kitchen sink. I tried to fill the tank(remaining 1/4) with hot water, let it drain, repeat, fill/drain but it's not draining any lower than 3/4 full.
Surely gray my tank isn't 3/4 full of residue? And now that I think about it, it was registering empty just a couple of weeks ago so I'm pretty sure it couldn't fill up that fast. I use screens on my sinks to prevent anything large from going down them.
Any ideas?

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