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Old 10-15-2014, 06:54 PM   #1
Join Date: May 2011
Posts: 35
Black tank flush valve

So I have emptied the black tank 4 times now since purchasing my new 3170. This last time though I noticed I wasn't getting much help from hooking a hose up to the flush valve on the outside of the unit. Am I doing something wrong? I would expect to be getting more water flow with the valve on and black handle open. I'll take any suggestions, I don't want to have a mess and smell in the tank. Thanks

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Old 10-15-2014, 07:01 PM   #2
Junior Member
Join Date: Dec 2012
Posts: 13
What is the level you have on your control panel. Maybe there is not a lot of liquid in the tank.

I normally add about two minutes of flush water to my tank just to have a liquid level before waste is added. Allows for better breakdown of paper and solids.

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Old 10-15-2014, 08:05 PM   #3
2014 XLR 27HFS
Join Date: Apr 2014
Location: Clearwater, FL
Posts: 332
I had no water going through my black tank flush at all. I found the back flow inhibitor valve behind a panel (first pic), took it apart, and made sure it was working - still no joy. So a few weekends ago, I got under the camper and found the line from the side of the camper to the black tank was tie wrapped flat and bent over backwards (second pic). I cut the tie wrap and did my best to pull the hose flat with tie wraps on each side of the kink - which now wants to stay. I even put a tie wrap around the kinked hose to help keep it round (third pic). Will be testing it on a trip this weekend. But I think this should do it. To make sure your tank is clean here are some tips; fill it over 3/4 before dumping - even if you have to pour jugs of water in it. Use a clear 45 degree elbow on the hose. keep filling and dumping till its running clear in the elbow. If you already have a smell, put 2-3 gallons of water in the tank, dump half a bottle of liquid dishwasher soap in it, and a bag of ice - then immediately take it for a spin with lots of corners and bumps. The soap and ice will scrub the tank clean.
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Dave & Audrey
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Old 10-15-2014, 10:43 PM   #4
Plain Old Member
Join Date: Nov 2012
Location: Full Timing in South Louisiana
Posts: 1,938
Hopefully you don't have the issue we had in our Forester 3121. We had let the tank get pretty full. We went to flush the tank, and got nothing from the flusher. The disolved toilet paper had worked it's way into the tiny holes of the flush nozzle in the tank. That in turn later formed a nice toilet paper plug inside of the nozzle. I had to pull and clean out the plug, then reinstall the nozzle. At least there was barely enough room to access it from the bay behind the right rear wheel.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.
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Old 10-18-2014, 08:31 PM   #5
Senior Member
Join Date: Nov 2012
Posts: 202
Black tank flush valve

My black tank flush clogged the other day as well after returning from a trip. No water was entering the tank. I removed the check valve in the bathroom vanity to make sure it wasn't stuck closed. It worked fine, so I stuck my air compressor nozzle into the water line going into the black tank, and blasted it several times. I could hear the rush of air and water in the tank. Reinstalled the check valve and supply hose. Works like a champ. Must have been clogged with TP like BigJohn mentioned.

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Old 10-22-2014, 11:02 AM   #6
2014 XLR 27HFS
Join Date: Apr 2014
Location: Clearwater, FL
Posts: 332
Update: the kinked hose was the issue. I can now clearly hear water blasting out the inside of the tank. Does a great job. Also much faster to refill the tank for the second flush now.

Dave & Audrey
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black, black tank, black tank flush, tank

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