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10-12-2020, 05:24 PM
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#1
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Member
Join Date: Sep 2018
Location: Tecumseh
Posts: 65
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Black Flush not working - First trip
Hey folks,
New Passport 2950BH owner and after our first shakedown trip, everything worked other than the black tank flush. It seems like there is a complete blockage in the line. Am I missing something or is this likely the issue?
Still under warranty, so anything outside of simple I'll leave for the RV shop when it goes back to have the rear ladder installed (was on order).
I connected the spray port hose to the black tank flush, and also tried with a direct hose connection. Couldn't feel any water moving through the hose, as it just felt pressurized like I needed to turn a valve. This model is just a screw connector below my spray port, just like the city water connection.
Fortunately for me, I have a rhino blaster from our last TT, and can also flush into my front yard cleanout when I winterize.
Any thoughts?
Now we just need to replace the metal blinds with accordion black blinds and we'll be all set.
__________________
TT: 2021 Passport 2950BH GT
TV: 2019 Chevrolet Silverado Trail Boss LT
Ontario, Canada
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10-12-2020, 06:03 PM
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#2
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Senior Member
Join Date: Jul 2014
Location: Hemlock
Posts: 816
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The anti siphon valve is probably installed backwards. It is usually under the bathroom sink. There is an arrow that indicates the flow direction. I would start there.
__________________
R.J. and Ginger
2019 Ram 3500 6.7 HO, Aisin Trans 3:73
Reese Goosebox
2019 Sandpiper 379FLOK
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10-12-2020, 06:09 PM
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#3
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,237
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Quote:
Originally Posted by tech740
The anti siphon valve is probably installed backwards. It is usually under the bathroom sink. There is an arrow that indicates the flow direction. I would start there.
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That’s what I’m thinking...once again a stellar PDI done by a highly qualified technician. NOT
__________________
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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10-13-2020, 09:37 AM
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#4
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Junior Member
Join Date: Sep 2020
Location: Gallatin
Posts: 12
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I am glad I ran across this thread. I had the exact same thing happen to me and my 21 Cougar yesterday on our maiden voyage. I am headed home from work right now to look into it more.
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10-13-2020, 12:37 PM
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#5
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Junior Member
Join Date: Sep 2020
Location: Gallatin
Posts: 12
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So my valve under the sink was indeed routed backwards. My next question is there any negatives to the valve sitting sideways or do the fittings need to be swapped to keep the valve sitting upright?
__________________
5er:2021 Cougar Half-ton 30RLS.
TV: 2000 F250 4WD 7.3psd, TS 6 pos chip, Gearhead Automotive Tunes, SB66 T4 turbo, Turbonetics Intercooler, 180/100 FullForce injectors, AirLift 5000 bags, Tekonsha Prodigy brake controller
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10-13-2020, 01:39 PM
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#6
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Senior Member
Join Date: Aug 2012
Location: Waco, Tx
Posts: 5,456
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Quote:
Originally Posted by Brycar77
So my valve under the sink was indeed routed backwards. My next question is there any negatives to the valve sitting sideways or do the fittings need to be swapped to keep the valve sitting upright?
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IMO the best thing to do with that $0.27 piece of plastic is to throw it in the trash. Get some pex 90 degree fittings and bypass it. Then get a $5 hose bib vacuum break for the end of your water hose. Never wonder when that plastic junk will leak.. notice I said when not if.
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10-13-2020, 03:29 PM
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#7
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Senior Member
Join Date: Mar 2014
Location: Mountain Home, Idaho
Posts: 2,977
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That cheap plastic anti siphon valve causes more flooded RVs than you can imagine. Your standing outside flushing your black tank ... so you think only to find water pouring out if the bathroom...
Many folks that use the built in tank flush forget to blow it out at end of year and when it freezes it cracks...and .. you get a flood next year when you clean out the tank...
Personally I’ve never in 7 years used the built in tank flush on my Alpine.. and won’t
__________________
2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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10-13-2020, 03:35 PM
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#8
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,237
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If the factory plastic valve isn’t upright it will leak.
__________________
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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10-13-2020, 03:59 PM
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#9
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Junior Member
Join Date: Sep 2020
Location: Gallatin
Posts: 12
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Quote:
Originally Posted by chuckster57
If the factory plastic valve isn’t upright it will leak.
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Perfect!!! Thanks for all the info guys!! I appreciate it more than you know. I apologize for hijacking your thread Bechard.
__________________
5er:2021 Cougar Half-ton 30RLS.
TV: 2000 F250 4WD 7.3psd, TS 6 pos chip, Gearhead Automotive Tunes, SB66 T4 turbo, Turbonetics Intercooler, 180/100 FullForce injectors, AirLift 5000 bags, Tekonsha Prodigy brake controller
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