It is impossible for the gray tank to overflow into the fresh water tank. Unless there is a serious misrouting of plumbing, there is absolutely no connection between the city water and the gray tank. There is a connection between the city water port and the fresh water tank since the water lines are shared that go from the city water port and from the fresh water tank to the pump. That is the only tank that can be filled when the city water is connected. Some people have had water come out the vent for the fresh water tank.
Look where you connect the hose. If you disconnect it, underneath a screened washer you will see a little piece sticking out of a piece shaped like a Mercedes symbol just inside the connection. That is the check valve. Press it, and you will feel it move. If there is pressure from the pump, you will have water come out of the city water connection.
The gray tank is where shower and sink water drain. The black tank is where the wastes from the toilet go. There is no interconnection between them and the fresh water tank. Now, if you are using gray to describe the color, then the fresh water tank is translucent white which may be what you are describing as gray. The gray and black water tanks are both opaque black in color.
Edit: Revisiting your first post, if this valve is where you are getting water, then it is likely not the city water connection you have connected to but the black tank flush. It looks the same, but the city water connection is the one next to the fresh water tank fill port. If yours is like mine, the black tank flush port is the one on the door side of the RPod. The tank that is filling is your black water (waste) tank. You don't want to do that. It is for flushing out the black water tank when you dump it. If you leave the hose connected, your tank will fill and you will likely have a very unpleasant fountain coming out of the top vent on your RPod.
------------- StephenH
Happy is the man that findeth wisdom,...
http://www.rpod-owners.com/forum_posts.asp?TID=7712 - ouR escaPOD mods
Former RPod 179
Current Cherokee Grey Wolf 24 JS
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