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Open Roads Forum  >  Tech Issues

 > Black Tanks Won’t Flush

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ENG2242

Missouri.

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Posted: 11/22/20 12:47pm Link  |  Quote  |  Print  |  Notify Moderator

I have two black tanks that discharge out one outlet. I have two unmarked black tank connections in the water compartment. Connecting to one, no water flows, when connected to the other, water discharges out the other. I tried a Y connection with no luck. I checked the only one way valve in the shower and it appears to be plumbed correctly. I cannot find another. Any suggestions?? Thanks David


David Hartmann
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alisonsawyer

California, USA

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Posted: 11/22/20 12:58pm Link  |  Quote  |  Print  |  Notify Moderator

Using a pressure washer or power washer.***Link Removed***

LadyRVer

Florida

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Posted: 11/22/20 05:54pm Link  |  Quote  |  Print  |  Notify Moderator

Could there be another slide valve located somewhere underneath? I had motorhome which had shut-off slide valve which had to be opened before it would come out the
normal outlet... sort of a safety situation. Just a thought.

way2roll

Wilmington NC

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Posted: 11/23/20 11:02am Link  |  Quote  |  Print  |  Notify Moderator

Trying to understand your issue. Is it that you have 2 black tanks and one drains while the other doesn't? What's a "one way shower valve"? How long have you had this Rv and did it work before? If the 2 connections in the wet bay are unmarked, how do you know they are for the black tanks? And if you have 2 blacks into one outlet, then how do you have 2 black tank outlets in the wet bay? Sorry for all the questions but I am really confused about the issue you are having.


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jwoods61us

INDY

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Posted: 11/23/20 12:11pm Link  |  Quote  |  Print  |  Notify Moderator

According to the Google you only have one black and one gray tank.

Specs for 2018 Heartland - Bighorn
Floorplan: BH 3870 FB
(Fifth Wheel)

Holding Tanks

Number Of Fresh Water Holding Tanks1
Total Fresh Water Tank Capacity 65.0 gal.
Number Of Gray Water Holding Tanks1
Total Gray Water Tank Capacity 90.0 gal.
Number Of Black Water Holding Tanks1
Total Black Water Tank Capacity 45.0 gal.


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kellem

Shenandoah valley,VA

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Posted: 11/23/20 01:53pm Link  |  Quote  |  Print  |  Notify Moderator

I'm betting you have a grey and black discharging together.

Have you properly identified all available connections such as fresh water fill, city hookup and black tank flush ?

Sorry for sounding elementary but not quite wrapping my head around this scenario your experiencing.

MrWizard

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Posted: 11/23/20 07:34pm Link  |  Quote  |  Print  |  Notify Moderator

Gray tank and black dump to the same outlet
Drain down the one hose,
One 3inch pipe and valve for the black tank,
And a smaller valve and pipe for the grey tank 1&3/4 inch pipe I think !
Personally my RVs have never had a grey tank rinse, I have only had black tank sprayer rinse,
And this RV does not have any at all, I end up flushing lots of clean water down the toilet to rinse the black tank, does not clean the tank sensors, No bathroom window and I don't like dragging a water hose thru the RV to use a spray wand down the toilet,

Two black tanks will have two 3 inch slide gate valves on 3 inch pipes,
Look at the valves , handles, and pipes
One large and one smaller is normal


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frankwp

Calgary, AB, Canada

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Posted: 11/23/20 10:22pm Link  |  Quote  |  Print  |  Notify Moderator

Perhaps the OP could better explain the problem, because it's about as clear as black water [emoticon] I can't tell if its the drain connections or sani-flush or what.


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MrWizard

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Posted: 11/24/20 02:12am Link  |  Quote  |  Print  |  Notify Moderator

I think he is saying he has 2 black tanks and only one will rinse from the installed sprayer

I think there is confusion , I think he has the , 1 grey. 1 black, grey water tanks don't normally get a rinse sprayer installed in a grey tank

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