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Old 01-21-2018, 09:53 PM   #1
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How do I know when the fresh water tank is full?

I have a 2018 Cedar Creek Champagne. My water hose screws onto the connection and there is a valve for CITY and RV. Set to RV it fills the fresh water tank. How do I know when the fresh water tank is full? Currently I go inside and watch the gauge. Is there an overflow somewhere?
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Old 01-21-2018, 09:59 PM   #2
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Overflow hose next to fresh water drain under fiver street side behind tires.
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Old 01-21-2018, 10:02 PM   #3
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Thanks diesel guy. So fill it until it overflows?
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Old 01-21-2018, 10:56 PM   #4
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Be careful, on my 33IK the overflow can be slower than the city input. I forgot once while filling and the fresh water tank blew up like a balloon. My floor and island were all puffed up and there was a loud pop (that is when I realized what I had done ). Just keep an eye on it.
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Old 01-22-2018, 12:01 AM   #5
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On our 33iK the overflow hose must extend into the tank several inches. Once it starts flowing it will continue to flow water even after turning off the supply. It must be creating a siphon. I have to put my finger over the hose get it to stop and break the vacuum. If not it will go down to 3/4 on the gauge before it stops.
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Old 01-22-2018, 08:39 AM   #6
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We've had 4 different RV's over the years our 36CKTS is goofy especially when filling the fresh water. Once it's full and begins to overflow it pours about 10 gallons of water on the ground.

We've tried a bunch of different ways of filling it and no matter what if a little water comes out of the overflow then 10 gallons comes out.

I'm pretty convinced the overflow hose put down into the tank and as it gets full it siphons out the 10 gallons. Another aspect of CC throwing trailers together to get them out the door.
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Old 01-22-2018, 09:27 AM   #7
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Y'all must of missed all the threads about overflow hoses and siphoning. I have put a valve or a fitting/cap on all my different rigs overflow hoses. Once I fill up the tank enough for water to come out the overflow, I cap it so I won't lose any water (especially on the way to our destination). After some water usage, usually a shower, I'll uncap it. Easy.
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Old 01-22-2018, 09:38 AM   #8
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OK thanks everyone. Next time I fill it I will too what the overflow does (while the DW keeps an eye out inside).
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Old 01-22-2018, 09:38 AM   #9
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Quote:
Originally Posted by NMWildcat View Post
Y'all must of missed all the threads about overflow hoses and siphoning. I have put a valve or a fitting/cap on all my different rigs overflow hoses. Once I fill up the tank enough for water to come out the overflow, I cap it so I won't lose any water (especially on the way to our destination). After some water usage, usually a shower, I'll uncap it. Easy.
X2 Good advice.
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Old 01-22-2018, 09:52 AM   #10
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Instead of doing the cap deal on the overflow line that will at some point be forgotten to be removed, I just pulled the belly pan plate from under the fresh water tank and made sure to remove the wire tie and kink in the overflow hose and rerouted the overflow line in a better thought out loop well above the tank, then back down towards the ground. I then installed a plastic screen like goes on the end of a field sprayer tank suction line to keep out any bugs. I don't have the siphoning issue. I'd heard several RV tech stories about a kinked overflow line ... this is what prodded me in to doing this. The overflow hose is attached to a tank fitting high up and does not run inside the tank. If your overflow hose is kinked and/or routed wrong ... it will allow the tank to overfill and swell (believe me they can do that). That's how lotsa water comes back out as the tank returns to normal size.
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