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Old 10-10-2020, 03:35 PM   #1
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Black tank flush question and one other issue

I'm a newbie to the RV scene and due to some health issues am just getting to take my 2019 Ventana 4002 out for some shake down trips before the warranty is out. Last week after dumping the tanks, I hooked up my black tank flush hose to the valve and turned on the water. Shortly thereafter, I heard water dripping. I looked in the wet bay and saw water, but could not see where it was coming from. The black tank valve was open. Did I do something wrong or miss something? There was no water dripping from under the RV, just a puddle in the wet bay.
My second question is at the campground we were on full hook ups. I originally had put about 1/3 full fresh water in our holding tank. My wet bay has Manual Fill and Auto Fill. I had the valve set to auto fill, but did not have the switch turned on in the driver's side overhead compartment. Later that day I noticed our fresh water tank was ready 100% full and some water had come out the overflow under the RV. Should that have happened or did I have something not setup correctly? Thanks for the help.
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Old 10-10-2020, 04:15 PM   #2
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Hi Gary - Looks like you found two items for the warranty trip. The fresh tank filling on it's own could be either a defective tank fill valve or the check valve in the water pump. Both are easy fixes and somewhat common. The black tank rinse issue sounds like a loose connection or a hose that got split. If you didn't winterize that flush line then a freeze could have caused it to split. Also could be from the build where something got pinched. Depending on where the leak is will determine how much time it will take to get to it and fix it.
Other than if you did the winterizing it doesn't sound like anything you did.



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Old 10-11-2020, 07:01 PM   #3
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I can't help with autofill...my 2016 didn't have that item.

The black tank flush dripping like that is a common problem. The black tank flush has an anti-siphon device in the line between your hose connection, and the spray head in the tank. It is commonly routed inside the cabinet in the half-bath under the sink. If you look inside...you will find the expected drain pipe for the sink, and the hot and cold water supply for the sink faucet. But you will probably see two more water lines coming up, and connecting to a plastic device that looks like a cap. If it comes unscrewed a bit...it will leak flush water, which normally will travel down the outside of the pipe, and dribble i side the wetbay. The flush water is supposed to pass thru the anti-siphon device in one direction. When you disconnect the hose, water will sometimes flow back out of the fitting. That is fresh water trapped in the line between the hose connection and the device. This device lets that water flow out, but NOT allow the line to begin siphoning waste water out of the black tank.
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Old 10-11-2020, 08:58 PM   #4
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Usually a black tank flush system will have an backflow preventer valve (mostly to prevent sewer gas backflow) between the air admittance valve and the black tank and another backflow preventer valve behind the flush hose connection in the water bay. All three are usually cheap plastic units and should be checked (then replaced with brass valves for a long happy life.
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Old 10-11-2020, 09:34 PM   #5
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Quote:
Originally Posted by FatChance View Post
Usually a black tank flush system will have an backflow preventer valve (mostly to prevent sewer gas backflow) between the air admittance valve and the black tank and another backflow preventer valve behind the flush hose connection in the water bay. All three are usually cheap plastic units and should be checked (then replaced with brass valves for a long happy life.

?????
Black tank flush system has an inlet hose connection (might have an internal check valve...might), an anti-siphon vacuum breaker and a spray nozzle

Air Admittance Valves are on sink drain lines to GREY tank.
They open when dumping grey tank so that the 'P' traps do not get sucked dry by negative pressure in sink drain line




OPs leak could be from loose fitting, bad flush line, bad connection at black tank nozzle
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Old 10-12-2020, 04:36 PM   #6
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Sorry, I did mean an anti-siphon (or vacuum break) valve that is also under the sink and admits air into the water line instead of a drain line.
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