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05-20-2023, 03:25 PM
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#1
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Junior Member
Join Date: Feb 2023
Location: Fallon
Posts: 13
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Black Tank Flush
What am I missing? I have a 2022 Keystone Alpine 3700FL and when I connect my water hose to the black tank flush connectors in the water box and turn on the faucet, nothing happens , no water enters black tanks to flush out. Black Tank drain valves are open and no water coming through. Tried with 2 different hoses. Any ideas or am 8 missing something to do ?
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05-20-2023, 03:30 PM
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#2
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Senior Member
Join Date: Jul 2022
Location: Elm Mott
Posts: 165
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Quote:
Originally Posted by kohi30
What am I missing? I have a 2022 Keystone Alpine 3700FL and when I connect my water hose to the black tank flush connectors in the water box and turn on the faucet, nothing happens , no water enters black tanks to flush out. Black Tank drain valves are open and no water coming through. Tried with 2 different hoses. Any ideas or am 8 missing something to do ?
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Valves could possibly be mislabeled or you are connected to the wrong. Are the gray tank valves also open?
__________________
Alpine Custom Upgrade in Elm Mott, TX
2021 Alpine 3650RL W/electric central heat
and 35 other inventions/improvements to it
2012 Freightliner M2 112 2L Conversions
450HP Detroit DD13 1,650 torque,
Allison 4000 automatic, 4.30 gear
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05-20-2023, 03:36 PM
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#3
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Junior Member
Join Date: Feb 2023
Location: Fallon
Posts: 13
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2 connections in the water box for black tank flush and have tried both, cannot hear any water entering tanks, and I have opened all the tanks to check also.
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05-20-2023, 03:50 PM
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#4
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,357
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The black tank rinser anti siphon valve is probably installed backwards. It’s more common than you think.
Locating it may take some hunting, popular spots are under the bathroom counter and behind the shower. Unhook the water lines and have a friend blow into the connection at the convenience center, that way you’ll know which line is IN and if it is kinked, another not so common issue. Look at the arrow on the valve for correct flow.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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05-20-2023, 04:28 PM
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#5
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Junior Member
Join Date: Feb 2023
Location: Fallon
Posts: 13
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Black Tank Flush
Is this what you are referring to?
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05-20-2023, 04:43 PM
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#6
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,357
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No. That’s an air admittance valve for a drain pipe.
Looks like this:
https://www.amazon.com/RecPro-Breake...04481564&psc=1
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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05-20-2023, 05:14 PM
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#7
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,701
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Quote:
Originally Posted by chuckster57
The black tank rinser anti siphon valve is probably installed backwards. It’s more common than you think.
Locating it may take some hunting, popular spots are under the bathroom counter and behind the shower. Unhook the water lines and have a friend blow into the connection at the convenience center, that way you’ll know which line is IN and if it is kinked, another not so common issue. Look at the arrow on the valve for correct flow.
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^^^^This sounds like your problem.
__________________
Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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05-20-2023, 09:23 PM
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#8
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Senior Member
Join Date: Feb 2019
Location: Wickenburg
Posts: 3,314
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Chuck's part is a correct part, though if you get a brass one they're much more reliable.
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05-29-2023, 04:10 PM
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#9
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Junior Member
Join Date: Feb 2023
Location: Fallon
Posts: 13
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RV techs came out and found water lines going to both flush tanks crushed and will be running new water lines.
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