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Old 04-25-2013, 12:55 PM   #1
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Possible water leak and failure of black tank flusher

We have an existing part time water leak in the area behind the water control panel- Also, the black tank flush does not allow water through to do it's job- I have not found the leak yet but do want to repair the flush mechanism today- Where is the back flush preventer located? Can it be bypassed temporarily? I am going to crawl into the bay and take pictures of the various connections, etc. Your experiences in this area will be much appreciated- THANX in advance for your replies- DD
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Old 04-27-2013, 03:12 AM   #2
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I was just installing one on my trailer today. Our trailer had the black coroplast I had to remove first. That was a job in itself due to all the gas line I had to deal with. Once your able to see the workings underneath you will readily notice the black tank due to the large drain pipe attached. Normally the flush kit is attach opposite the drain connection. Some have installed their back flow preventer next to the tank fitting. Some of those who have had leaks from water in the hose coming out the back flow preventer. If this is the case remove the preventer and attach it net to your water source. Others have had the clear hose connection fail. If the clear hose is in use I would advise replacing it with a better hose. Get yourself a creeper from Harbour Freight and safety glasses. I'm sure if you take your time you can figure it out. Good luck.
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Old 04-27-2013, 04:49 AM   #3
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Before you get too far you should check one thing. On the black tank flush supply line there will be a backflow preventor and if it fails it will let water leak right at that location. It is doing it's job. This one failure could be both problems.

I had this happen on my new, then, 322FKS and needed to replace the valve. Solved both problems.
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Old 04-27-2013, 08:42 PM   #4
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Where is the backflow preventer located? Would it be possible to give the flush outlet a shot of air pressure to open up the flusher if it's plugged? Opening the underbelly is not my idea of fun- THANX for the replies- DD
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Before you get too far you should check one thing. On the black tank flush supply line there will be a backflow preventor and if it fails it will let water leak right at that location. It is doing it's job. This one failure could be both problems.

I had this happen on my new, then, 322FKS and needed to replace the valve. Solved both problems.
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Old 04-27-2013, 11:57 PM   #5
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Opening the underbelly is not fun but I've done much worse jobs in my life. You could try giving it a shot of air but not too much. You could blow the sprinkler head off the line. For some reason some people attached their back flow preventer on the end of the hose next to the tank. It is a black and grey collar about an inch around with multiple holes in the top part of the collar. These have leaked water from the inlet line when shutting off the water. You may not even have one attached. Others have had leaks from the inlet hose that came with the kit. I did a search on this prior to installing mine and this is what I have read on multiple posts. The instructions on my kit say to install the preventer next to your source pipe. Hope this helps.
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Old 04-28-2013, 05:38 AM   #6
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My BF preventor was in the cabinet right behind the toilet and just inside the trailer from the hose connection. They don't usually go too far with this piping. My leak actually came out into the living area.
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Old 05-02-2013, 05:58 PM   #7
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THANX for all replies- We had to take the Eagle to a dealership [ NOT a Jayco dealership ] to have some Dish related problems solved- Had the tech repair the flush problem- The backflow preventer is located behind the shower and is accessable through a cutout in the pantry- Due to the location of the failed part [ approx. 3 foot above the black tank ], I opted to have the part replaced with a straight through elbow resulting in better water flow to the flusher- I do not do business with the local Jayco dealer- The Dish problems arose because of the methods used by a Dish contractor resulted in our inability to watch ota tv in the bedroom and the inability to watch tv on cable period- JMHO- DD
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Old 05-02-2013, 09:36 PM   #8
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So in you description of the repair, it sounds to me that you had the backflow assembly removed and replaced it with a strait thru fitting. If this is correct, as a plumber this is not a good idea. you now have a direct connection between the potable water supply and a sewage tank when the flush hose is hooked up. I recommend in the strongest terms that you attach a backflow device to the hose connection on the trailer before flushing and to not use your water hose, use one that is just for tank flushing to protect yourselves and others from cross contamination.
Plumbers protect the health of the nation, but we need your help too.
Best of luck.
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Old 05-03-2013, 01:20 PM   #9
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So in you description of the repair, it sounds to me that you had the backflow assembly removed and replaced it with a strait thru fitting. If this is correct, as a plumber this is not a good idea. you now have a direct connection between the potable water supply and a sewage tank when the flush hose is hooked up. I recommend in the strongest terms that you attach a backflow device to the hose connection on the trailer before flushing and to not use your water hose, use one that is just for tank flushing to protect yourselves and others from cross contamination.
Plumbers protect the health of the nation, but we need your help too.
Best of luck.
I use a dedicated hose to operate the back flusher- The tech who did the work said it is a common repair- I appreciate your reply and am reconsidering my actions- THANX- DD
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Old 05-03-2013, 02:10 PM   #10
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I use a dedicated hose to operate the back flusher- The tech who did the work said it is a common repair- I appreciate your reply and am reconsidering my actions- THANX- DD
As a fellow camper I am less concerned about your individual hose, but the water supply it's self. With out a backflow preventer you put the water supply at risk for the next camper in that spot.
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