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Old 09-10-2016, 12:23 PM   #1
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Fresh water / City water relationship?

Newbie, quickly maturing with 90+ days on the road, 2016 Classic, connected to city water @ CG with a filter, turned on the faucet this morning & no water. Tried the fresh water (turned on the pump) and it worked fine. Investigated and city water supply was functional up to point of entry to coach, but no flow at the tap. Checked the gauge that showed the fresh water supply was at 75%, so I filled the fresh tank. Tried the system again and now I have water, both fresh and city. So my conclusion is that I need to have the fresh tank >75% full to have functional city water flow. Is this how it works? Or is there a problem somewhere? Is there a valve that regulates this?
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Old 09-10-2016, 12:25 PM   #2
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Shot in the dark here - but did you perhaps have your hose connected to the black tank flush and not the city water? Then when you filled the Fresh tank and reconnected your hose, you connected to the City input?

You might want to check your black tank to see how full it is.

Again - shot in the dark here...
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Old 09-10-2016, 12:42 PM   #3
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Shot in the dark here - but did you perhaps have your hose connected to the black tank flush and not the city water? Then when you filled the Fresh tank and reconnected your hose, you connected to the City input?

You might want to check your black tank to see how full it is.

Again - shot in the dark here...
I have seen people do that three times in the last 3 months. The result can be rather exciting.
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Old 09-10-2016, 12:56 PM   #4
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Originally Posted by synapticon View Post
Newbie, quickly maturing with 90+ days on the road, 2016 Classic, connected to city water @ CG with a filter, turned on the faucet this morning & no water. Tried the fresh water (turned on the pump) and it worked fine. Investigated and city water supply was functional up to point of entry to coach, but no flow at the tap. Checked the gauge that showed the fresh water supply was at 75%, so I filled the fresh tank. Tried the system again and now I have water, both fresh and city. So my conclusion is that I need to have the fresh tank >75% full to have functional city water flow. Is this how it works? Or is there a problem somewhere? Is there a valve that regulates this?
Water should go into the inlet at any time a faucet is open. If the fresh water tank is dry, city water should still go in the inlet. There was some other issue.
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Old 09-10-2016, 05:17 PM   #5
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Definitely not the case. I was flushing the black tank yesterday and had left the "dirty hose" attached, so that mix up wasn't the cause.
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Old 09-10-2016, 05:22 PM   #6
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That's why I asking if there is a valve or some other point of possible obstruction that could occur. I assume the freshwater tank is separated in some way from the inflow of the city water.
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Old 09-10-2016, 06:35 PM   #7
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That's why I asking if there is a valve or some other point of possible obstruction that could occur. I assume the freshwater tank is separated in some way from the inflow of the city water.
The only connection between the two is that the pump discharge and city water inlet essentially feed into the same cold water system. The level of water in the tank has no impact on the city water inlet.

I don't think there is a valve on the back side of the city water inlet. The only thing I can think of would be a hiccup in the pressure reduction part of the city water inlet. Removing the pressure may have 'reset' it.
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Old 09-11-2016, 01:18 PM   #8
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Agree with HighJoeSilver; maybe the the pressure reduction device at the water inlet was stuck and released when the OP was playing around. Fresh water tank is completely separate from city water supply. The check valve in the pump is the isolation point, so no tie in to tank levels!
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Old 09-11-2016, 01:34 PM   #9
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Have you checked the city inlet connector for a blockage? My screen gasket clogged up with gunk one time, and stopped the water flow.
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Old 09-11-2016, 04:14 PM   #10
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I have seen people do that three times in the last 3 months. The result can be rather exciting.
Yes, the infamous fecal storm
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Old 09-12-2016, 05:37 AM   #11
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Yes, the infamous fecal storm

Perfect!
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Old 09-12-2016, 08:53 AM   #12
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Probably a clogged mesh screen at city water intake, or a defective water pressure regulator just behind same intake IMO.

Your problem does not suggest the following is the cause, but FYI, the water pump does have a back flow valve just downstream which prevents pressurized city water from reaching the pump and fresh water tank. Could this be part of the problem?

I would try to recreate the problem, to make sure your diagnosis is consistent, and call/visit the dealer if it happens again.

Good luck!

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Old 09-12-2016, 06:00 PM   #13
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Your problem does not suggest the following is the cause, but FYI, the water pump does have a back flow valve just downstream which prevents pressurized city water from reaching the pump and fresh water tank. Could this be part of the problem?

This wouldn't cause a loss of city water pressure. Keep using it, if it happens again you may need a new fresh water inlet. I think AS is still using the shurflow inlet these days, good thing is they are <$40 and readily available. Plus you have a backup system in place that can easily tide you over until you can replace it.

Out of curiosity, had you been at the CG for a while?
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Old 09-12-2016, 06:23 PM   #14
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Is there a plumbing diagram for the clean water flow including the tank and city water?
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