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06-10-2018, 06:07 PM
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#1
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Junior Member
Join Date: Jul 2017
Location: Minneapolis
Posts: 17
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Black tank flush plugged
Seems the black tank flush is plugged in our 2011 Ultralight Passport. I hook up the water and it doesn't flow into the tank. Is the assembly somewhat accessible?
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06-10-2018, 06:15 PM
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#2
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,996
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Did it work last year? If so, then if you removed the anti-siphon valve for the winter, did you reinstall it "backwards" ???
If not, then it's probably some "dried gunk" on the end of the spray nozzle inside the black tank. You may be able to loosen anything that's dried to the nozzle by filling your black tank, adding some "digester" chemicals and letting it sit for a few days.
If you do need to access it, you'll probably need to remove the coroplast underliner beneath your trailer to get to it. While it's not impossible to do, it is time consuming and you'll be working "on your back under the trailer to pull the screws, rivets or power driven nails to drop the coroplast. Pay attention to how it comes off so you can reinstall it the same way !!!!!
I'd first check that anti-siphon valve to be sure it's installed properly and is working.
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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06-11-2018, 10:43 AM
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#3
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Senior Member
Join Date: Sep 2017
Location: Sammamish
Posts: 256
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When I used mine yesterday I was surprised at how long it took for the water to start flowing out. With the small holes it comes out with force but much less volume than what you get from a hose, and they can get clogged up. I got this shot from a Youtube video.
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2017 Springdale 202QBWE, 2017 F150 XLT 5.0
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06-11-2018, 11:04 AM
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#4
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Junior Member
Join Date: May 2018
Location: Aylett
Posts: 1
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newer models have back flow preventers (check valves) in the supply line prior to entering the tank itself. They are normally installed on the same side of the trailer where your flush hose fitting is. They are also located in a cabinet or under a sink in the living space of the trailer. Once found, you will see an in-feed line into the device and a discharge line from the device. I took mine out and replaced with a 90 degree 1/2" brass fitting. Theses check valves are famous for trouble.
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06-11-2018, 11:11 AM
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#5
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Senior Member
Join Date: Feb 2018
Location: Richmond
Posts: 113
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I went to the video and watched how to repair the black tank flush valve wow it seems pretty straight forward and easy.
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Doug & Diane * Richmond,VA
2014 Keystone Cougar
M-315 High Country 5th Wheel
2014 RAM 2500 Laramie 392 Hemi
AirLifts
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06-11-2018, 12:05 PM
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#6
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Senior Member
Join Date: Oct 2014
Location: Germantown, TN
Posts: 6,332
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Mac, don't get the cart before the horse. First, before you start making plans of a major repair job, take the advice given so far. Be POSITIVE that your anti-siphon valve is fully operational, and that there is water pressure at the valve. It is doubtful that all the holes in the flush system would be plugged up.
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Jim in Memphis, Wife of 51 years is Brenda
2019 F450 6.7 Powerstroke
2018 Mobile Suites 40RSSA
2021 40' Jayco Eagle
2001 Road king w/matching Harley sidecar
2021 Yamaha X2 Wolverine 1000
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06-11-2018, 01:27 PM
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#7
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Senior Member
Join Date: Mar 2014
Location: Mountain Home, Idaho
Posts: 3,013
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If you are lucky like we are the sewer drop. Line is a straight level shot into our black tank. I use an external Valtera clean out connection with clear tube and gate valve. I can see when the black tank is clean. Never used the black tank built in flush connection nor do I intend to
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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06-11-2018, 02:05 PM
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#8
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,751
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After watching that video I have one piece of advice, Always, ALWAYS use a table cover on public picnic tables! SHUDDER, SHUDDER, GAG.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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06-11-2018, 03:58 PM
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#9
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Senior Member
Join Date: Jan 2014
Location: Winnipeg, Canada
Posts: 1,196
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After a couple of years, our black tank flush was plugged. Turned out to be kink in the pex. It probably started as a bend and over the years it kinked. A 90 degree elbow solved the issue.
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2018 Jayco Eagle HT 265BHS (previous: 2015 23RB Passport Elite, ProPride)
2015 F250 XLT SB Crew, 6.2l gas
PullRite 16K SuperGlide w/SuperRail
Reese 5th Airborne (bagged) Pin Box
RoadMaster Shock Kit
X-Factor Cross Bracing
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06-17-2018, 04:31 AM
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#10
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Junior Member
Join Date: Jun 2018
Location: Kitchener
Posts: 1
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Hoping this is the correct place to post this.. I Just purchased a brand new 2018 Passport 2670bh and when connecting the hose to the black tank flush inlet and turning on the hose nothing happens. Seems like it is plugged OR there is a valve somewhere that I have to open? If so, any ideas where it might be or look like? Any feedback would be greatly appreciated.
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06-17-2018, 04:56 AM
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#11
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,345
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Welcome to the forum
Most likely the anti siphon valve is backwards. Common place is under the bathroom sink, or behind the shower faucet knobs. Some members have replaced it with a brass one, I still have the factory one.
When you find it, there will be an arrow on it indicating direction of 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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