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Old 07-29-2012, 04:57 AM   #1
kisgrigg
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Gray water tank won't empty

I am a new owner of a Montana Mountaineer 375 FLF. Last night my daughter was taking a shower and the shower base wouldn't drain. The #2 Gray tank shows full, but both of the gray tank dump handles are pulled out. I cycled them both several times, and no difference. Any suggestions?
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Old 07-29-2012, 05:18 AM   #2
SteveC7010
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Quote:
Originally Posted by kisgrigg View Post
I am a new owner of a Montana Mountaineer 375 FLF. Last night my daughter was taking a shower and the shower base wouldn't drain. The #2 Gray tank shows full, but both of the gray tank dump handles are pulled out. I cycled them both several times, and no difference. Any suggestions?
Just to cover all the bases, check all these things:

1. You're on a site with a sewer hookup.
2. Your sewer hose is properly connected to the trailer's drain point and the sewer hookup.
3. There is not another drain valve somewhere in the system that isn't open.
4. You have one drain point 2which is connected and open.
5. You know that the valves are correctly labeled.

Does the other gray tank drain OK?

Possible problems:

If your drain valves are on remote cables, it's possible that the cable has separated from the valve.

The shower drain is plugged (unlikely since the tank shows full, but needs to be ruled out.)

Something is blocking the drain line somewhere from the valve to the sewer hookup.
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Old 08-03-2012, 02:30 PM   #3
billstuart
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Another possibility is that, like many of us, your black and gray tank valves are mis-labeled. Try opening the valve labeled black and if your gray tank drains, you'll know they're mislabeled.

Happy trails,
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Old 08-11-2012, 04:45 AM   #4
JP4
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I have a 2012 Passport 5th and just checked the labeling on my dump valves and they were labeled backwards (like many others - thanks for the tip!). Glad I checked this before I left on her maiden voyage. Swapped the labels and now all is good with the world once again!
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