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Old 06-07-2013, 07:10 PM   #1
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Can't fill fresh water tank 2009 20' Flying Cloud

First outing dry with new-to-us Flying Cloud. Water goes in filler hole, blows right back out. Can't force feed it more than a couple of gallons with a 5 gallon container manually with long flexible nozzle. No (none) water will go in with city water hose feed. Just blows back out. I've tried five days worth of fixes and nothing works. Neoprene hose deep into tank with funnel, (blows back up the tube) lowered the front of the coach all the way, lowered the rear all the way, all faucets open, all faucets closed, pump on, pump off, drain petcock open, drain petcock closed. No change. Water always blows back out with pressure. Even blows through the tiny hole where the plastic water cap hanger is attached. City water works fine. This is my second Airstream. 19' International CCD. First Flying Cloud. First encounter of this sort in any RV I've owned over the years. Needless to say, I'm not a plumber. Anyone else experience this problem? Jeff
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Old 06-07-2013, 07:36 PM   #2
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Is it possible that the water tank is full and the gage is wrong?
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Old 06-07-2013, 07:57 PM   #3
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Try a dip stick or open the bottom drain on the tank. The tiny hole is the overflow/vent. sounds like a full tank. Discomnect city water and try to pump the tank down using the faucets.
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Old 06-07-2013, 08:08 PM   #4
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Forgot to mention. I also completely drained the tank with the tank petcock. Let it drain for an hour or so. Water stopped draining and the gauge read empty (the gauge was reading okay). Still could barely force feed a couple of gallons back in by gravity feed using a neoprene hose with the coach lowered all the way in the front. After a couple of gallons (using a 5 gallon potable water contrainer) the water literally blew back out the filler hole with a loud gurgling noise and backed up into the tube and back into the funnel. I quickly pulled out the hose and screwed the cap back on just so what little water was in the tank stayed there. Perplexing problem.
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Old 06-07-2013, 08:27 PM   #5
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I am only guessing now, but it sounds like your tank vent line is not working. When that happens, the water you put into the tank cannot displace the air and will blow back in your face. If possible check the air vent tube (the little one) to see if any air is coming out of it when you try to fill the tank. Since it is a little line, I could imagine it got kinked or crushed somewhere preventing it from venting.
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Old 06-07-2013, 08:30 PM   #6
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My understanding is that the FW fill tube and smaller vent tube simply connect to nipples on the top of the tank. The behavior you describe sounds like they are both connected to tubes that extend down to the bottom of the tank such that water flowing in is limited to the air bubble as it compresses above it. While this might explain what you are experiencing, I really doubt that it plumbed that way. I think idroba has described the most likely cause for this.
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Old 06-07-2013, 08:57 PM   #7
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Got it..me too. I think idroba hit the nail on the head. I'll check the vent on Monday and get back. It's parked elsewhere.
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