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Old 03-18-2019, 12:51 AM   #1
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2019 3901 wb

bought in November 2018....now question is where is the vent for freshwater tank? There is nothing sticking out of belly anywhere except at right rear that has cap on blue line was told that would help drain water from kitchen area. There is nothing attached to vent where you fill it..any thoughts or info?....Don't want to blow it up filling it and there is no gravity fill...
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Old 03-18-2019, 01:47 AM   #2
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On the older units there were two lines extending through the Belly near the Fresh Water Tank, one with a valve or cap that's the Drain and a second that is the vent/overflow line.
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Old 03-20-2019, 06:10 PM   #3
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yes the other 2 redwoods we had was like that but this one is not....guess call the builder is next thing to do...thank you...
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Old 03-22-2019, 02:30 AM   #4
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bought in November 2018....now question is where is the vent for freshwater tank? There is nothing sticking out of belly anywhere except at right rear that has cap on blue line was told that would help drain water from kitchen area. There is nothing attached to vent where you fill it..any thoughts or info?....Don't want to blow it up filling it and there is no gravity fill...
..............found them behind rear axle on convenience door side
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Old 03-23-2019, 04:10 PM   #5
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That looks like the fresh water tank drain.... Mine had a cap like that, I replaced it with a good ball valve that I got from a big box store.

IF that is the fresh water tank VENT tube, I also put a ball valve on that to prevent the tank from having a siphon when driving. It stays open at all times except for the first mo e after the first move with a full tank.
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Old 03-23-2019, 05:20 PM   #6
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Look in the water service connection bay. There should be a white plastic looking vent. Water will blow out there when full.
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Old 03-23-2019, 06:13 PM   #7
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Black and 2 grey tanks are in front... fresh water appears to be near over the axles from what I could see with out taking down rear under belly....maybe this will help some one if they have the newer 3901 wb....
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Old 03-23-2019, 11:12 PM   #8
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Look in the water service connection bay. There should be a white plastic looking vent. Water will blow out there when full.
If the vent is connected to that spot on your RW you definitely have the odd one, none I've seen or heard about have it connected there, all vent down below the coroplast.
I'd look behind the panel, you may be surprised to find there's nothing connected to that vent. I do agree, every other rv we've owned vented from that spot.
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