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moparcanuck's avatar
moparcanuck
Explorer
May 06, 2013

Water filler overflow tubes

Hey all,

We got our new (to us) 1994 Newmar motorhome back home for the first time this weekend. Everything seems to be working great on it. However, we did notice one oddity that I'm hoping someone can clarify and/or help with.

We tend to do pretty much all dry camping, so of course we want to pack in as much water as possible. Our fresh tank seems to have 4 (yes, 4!) overflow/vent tubes. There's a set on each side of the tank, driver and passenger. Each side has 2 hoses. One is a larger, maybe 1.5" green and white coiled tube which goes out and then goes through a hole in the storage bay to drain below the unit onto the ground. The second one is a clear tube, maybe 0.5" that comes out and would drain right into the storage bay(!?). Both are coming out of the top of the tank, and near as I can tell serve a double purpose of venting while filling, and preventing overfilling. However, even if I'm careful in filling full, but not overfilling, I'm worried that while driving, the sloshing will make water spill over the top and into the cargo bays.

Does anyone have a similar setup and any advise? Or am I looking at it all wrong? It seems like way overkill to have 4 vents/overflow lines.

Thanks

5 Replies

  • The large green one is the overflow/vent and as said the 2 smaller ones are drains with a shut off on both and then you have another small one (in the cabinet) that should have a flexible line on it for adding antifreeze for winter, it also has a shut off valve and a plug in the end of the flex line. Jim
  • Are the drain holes on the TOP of the tank like in the middle or any on the top near the sides?
  • Okay, I have a pic, but ummm, can not seem to find a way to attach it.

    To respond to the above, the drain hose is a separate 1/2" drain that comes out of the bottom of the tank, both these hoses, on both sides are on top of the tank.

    One of the green/white ones does double as the filler tube on the passenger side, but is only a vent on the driver side.
  • My 99 Mountainaire has the same but the 1/2 inch ones have a in-line shut off valve to use to drain the tanks and they are threw the floor of the bay.