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Old 07-07-2013, 12:30 PM   #1
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Fresh water - where did it all go?

Recently spent 4 days dry camping in a local state park. Full fresh water tank lasted all four days. Filled up again and took off for Skyline Drive. By the time we got to the Lewis mountain Campground the tank was down to 1/3. The entire trip was spent on US50 and US33 so we are talking a roller coaster ride. Is it possible that the water sloshed out the overflow as I went up and down the 7-10% grades I was driving on?

I didn't notice the water was low till we stopped to take some pictures and I heard the water pump running when there wasn't anything on. There was a higher than expected amount of water in the rear black tank. But with the 66 gallon fresh tank and 45 gallon black tank, the 2/3 full black tank does not equal the 44 gallons missing out of the fresh tank.

This was on a 2013 Coachmen Mirada 35DL. Thoughts appreciated!
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Old 07-07-2013, 12:45 PM   #2
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Don't run down the road with the pressure water pump switch on.
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Old 07-07-2013, 12:49 PM   #3
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Don't run down the road with the pressure water pump switch on.
Makes sense in retrospect and I won't moving forward, but can you give me a reason why? If it was running, where did it go? Curious minds want to know. :-)
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Old 07-07-2013, 01:16 PM   #4
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Makes sense in retrospect and I won't moving forward, but can you give me a reason why? If it was running, where did it go? Curious minds want to know. :-)
Leaking toilet and other faucets not completely closed?
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Old 07-07-2013, 01:59 PM   #5
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I lost half a tank on a rough road once.
Now if I am traveling with full tank of water I put a spring clamp on
the vent/over flow hose.
It's easily accessible inside my pass thru storage.
I also put a sticky note over the pump switch to REMOVE the vent clamp
B 4 turning on the pump.
Leave the vent clamped shut and you could collapse your tank!
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Old 07-07-2013, 07:08 PM   #6
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Did you leave a low area drain open or the fresh water tank drain?
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Old 07-07-2013, 07:58 PM   #7
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Quote:
Originally Posted by _nelsonc View Post
Recently spent 4 days dry camping in a local state park. Full fresh water tank lasted all four days. Filled up again and took off for Skyline Drive. By the time we got to the Lewis mountain Campground the tank was down to 1/3. The entire trip was spent on US50 and US33 so we are talking a roller coaster ride. Is it possible that the water sloshed out the overflow as I went up and down the 7-10% grades I was driving on?

I didn't notice the water was low till we stopped to take some pictures and I heard the water pump running when there wasn't anything on. There was a higher than expected amount of water in the rear black tank. But with the 66 gallon fresh tank and 45 gallon black tank, the 2/3 full black tank does not equal the 44 gallons missing out of the fresh tank.

This was on a 2013 Coachmen Mirada 35DL. Thoughts appreciated!
I think the pump running on occasion is insignificant. I believe like Kydan the loss was through the vent of the FW tank. By sloshing on a rough road, you can start a siphon effect and the rolls of water keep it going until the vacuum is broken at low level. Its been reported here a few times of folks losing water out the overflow. The vent should rise some distance above the tank but they don't, perfect scenario for a siphon effect.
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Old 07-07-2013, 08:05 PM   #8
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Leaking toilet and other faucets not completely closed?
X2. yer just lucky that nothing was closed and able to run over, and flood. I NEVER leave my water pump on when I am away from the camper. I ought to turn the camp site water off also, but I am to lazy. I should put a solenoid valve and switch in.
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Old 07-08-2013, 05:57 AM   #9
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I think the pump running on occasion is insignificant. I believe like Kydan the loss was through the vent of the FW tank. By sloshing on a rough road, you can start a siphon effect and the rolls of water keep it going until the vacuum is broken at low level. Its been reported here a few times of folks losing water out the overflow. The vent should rise some distance above the tank but they don't, perfect scenario for a siphon effect.
I tend to agree. The drains were all closed, the sinks were all dry, and the toilets were not full of water. The wet bay was dry so the outside shower was not on. The only place this water could leave was through the vent. We drove half of Skyline Drive and quite a few mies on the Blue Ridge Parkway and there were several 7-10% grades along the way.
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Old 07-08-2013, 07:33 AM   #10
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Quote:
Originally Posted by VinceU View Post
I think the pump running on occasion is insignificant. I believe like Kydan the loss was through the vent of the FW tank. By sloshing on a rough road, you can start a siphon effect and the rolls of water keep it going until the vacuum is broken at low level. Its been reported here a few times of folks losing water out the overflow. The vent should rise some distance above the tank but they don't, perfect scenario for a siphon effect.

Agree; Once there is water in the vent hose, Venturi Effect will maintain the siphon until there is no way sloshing water can get to the vent line.

That will be "about" 1/2 tank. However, depending on how you park (levelness), 1/2 tank can leave the water level at the tank sensor too low to touch the 1/2 tank indicating sensor.
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