2014 3402RL--how big is front and rear Gray tank?

[scottandanna]

Working on cleaning out the front gray tank, which the shower drains into. I can fill the rear one, that the kitchen sink drains into, in about a week, but the front shower one with bathroom sink and vanity sink, I have yet to get the sensors to read above 1/2 full in over a week. (Notice I said "sensors read" since I am not convinced that the sensors are working correctly, part of my original problem).

So, I closed the galley tank valve, let it fill completely up so my kitchen sink would no longer drain, and I was able to pull the dump valve and clean a good bit of nasty black crud from that tank.

Trying to do the same with the front gray tank, but I have no idea why it is taking so long to fill up.

Specs say only one gray tank, and 93 gallons, but I am assuming 50 gallons in the front, same size as the black tank, and 43 gallons in the galley? But if so, the front tank would fill up quicker than the rear one, because of the showers, brushing teeth, taking meds, etc vs just doing dishes in the kitchen.

I know we have two gray tanks, so at least that part of the specs is incorrect.

[twindman]

On my Monty, the bathroom sink actually is piped into the black tank. I noticed when I had the rear wall of the storage area off. I think I am the only one I have heard of that have the plumbing this way, but maybe you are too. So if you are filling the tank via the sink, this could be the problem.

[scottandanna]

I have the gray and black valve pulls in the "control panel" area in the storage bin, but a second gray tank valve pull back under my TV/fireplace slideout. So I am sure I have two gray tanks, and I am sure the sink runs into the one with the valve under the TV.

I have heard of bathroom sinks going into the black tank, maybe even showers, but never the kitchen sink. That is actually kind of a gross idea. Considering that when I finally filled my sink tank to the point where the sink would back up, glad that was NOT black tank liquid!!!

[scottandanna]

With the location of the front black and gray tank, I would assume that only the toilet goes into the black tank in our trailer. They would only have to use a couple feet, if that, of tubing to route them all to the gray. Even though the toilet and black tank are right underneath. Maybe next time I pull the valves, I may run the sinks and verify that they are not exiting through the black tank.