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Mike S. 10-12-2014 10:42 AM

Washing out the black tank
We just brought home a new 2014 international 25fb. We stopped at a campground overnight. When I went to flush out the black tank with the external hose connection, more water came out of the belly pan than the black tank. Is there an easy way to check the connection of the hose to the black tank? Probably should have tried this at the dealer, but didn't think it would be an issue. Thanks for your input, Mike

SteveH 10-12-2014 10:49 AM

You have a broken line. I'd advise taking it back to the dealer for warranty repair.

Landrum 10-12-2014 11:47 AM

It may be the vacuum breaker located just inside the AS behind the sewer sprayer connection. These are notorious for breaking. You might want to open the door under the wardrobe (the panel with the round heater vent is actually a hinged door) and see if the floor is wet). You'll still need to get it fixed obviously but at least you might determine what is leaking.

I'm not saying you should do this but....... It looks like these aren't hard to replace. I know for me it would easier to fix myself than go to the hassle of taking my AS in for service.

If you do a search you'll find many posts about this issue.

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Landrum 10-12-2014 11:51 AM

1 Attachment(s)
I may have called it the wrong thing but this is what I was talking aboutAttachment 224199

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HowieE 10-12-2014 11:56 AM

That feature is a complete waste of time and money. Even with it being a new trailer I would just remove it and seal the line coming up from the tank.

If you are concerned about flushing the black tank try this. Drain the black tank. While lifting the hose, at the connection to from a trap, open the gray tank and count to 10, drop the hose and close the gray tank. This will put considerable more water into the black tank than the sprayer will. Once the water gas stopped draining from the black tank close that valve an open the gray.

Mike S. 10-12-2014 02:29 PM

Thanks. Will go and try to find what to fix. The closest dealer is a few hours away so fixing myself is the best solution. Not to fond of the valve setup for dumping on the the new trailer. No labels to know which handle goes to which tank. I guess things are more compact this way, less chance of getting knocked off. Gotta get used to it now though. Thanks again, Mike

HowieE 10-12-2014 02:59 PM

You have to figure out which is witch or you will have dirty hose to deal with.

The position of the toilet should tell you which is which, more than likely the back one. If you want a test run a few gallows of water into the gray tank. hook up to dump. You should only hear flow from the gray tank. note for the future.

Mike S. 10-12-2014 03:14 PM

Howie, thanks. I took my flashlight and looked past the metal guard and could see the black and gray valves. The handles are both black. Will definately lable them for future reference. I found the hidden compartment to the area mentioned above. The floor was not wet so I am thinking the leak must be at the connection to the black tank. I'll probably just use the gray tank to flush or run a hose in to the toilet and run water down from there until I can get it back to OH to be fixed. Thinking I am going to start a list of things that need to be fixed and make a roadtrip next fall. Thanks again

AnnArborBob 10-12-2014 03:22 PM

I second Landrum on this, the vacuum breaker on the black tank flush is probably broken since it is the weak link on this system. It's an easy fix to do if you are moderately handy. Do check the floor under your wardrobe to see if it is wet after you run the black tank flush, if it is not wet, then the leak is probably someplace else. Some people replace the vacuum breaker with a metal one, others just replace it with a piece of straight pipe and use a back flow preventer on their hose.

I find the black tank flush to be very useful to getting <nearly> all of the solids out of the tank and would not want to live without it.

polarlyse 10-12-2014 03:31 PM

IF you have black water leaking into the belly pan that's not a do-it-yourself job. At least not for me if I have a warranty to cover it. Grey water and fresh water I would tackle but black water, not for me. Now, if I had no warranty I gotta do what I gotta do. If you use one of those clear elbows on your discharge line you can quickly determine which handle is black or grey. It also is helpful to be sure you're getting a good flush. Some of us are entertained by simple things.

cwf 10-12-2014 04:46 PM

Our "black tank washout" was also broken... it was a 1999 and had been broken for a while. We had it repaired by a local 'rv' guy while he was helping with some other tasks. He just drilled another hole in the tank next to where the old one was broken off and had been epoxied shut... works fine.

We like it because we can 'add' water quickly to the black tank after a flush... I let it run about 2 minutes, then while still running, open the black tank valve a second time.. lots more flushable contents slide out... I do that twice if I will be stowing the AS. Otherwise I add another '45-60 seconds of water run time then add the Toilet packets.

If you get enough in the 'black tank' I will wager you will get some 'leakage' ... not good in your NEW AS....

Mike S. 10-12-2014 05:25 PM

I'm sure that no "black" water was leaking into the belly pan. Just water from the hose connection. So it's gotta be the hose connection to the top of the tank if the floor was dry. Hopefully. I think I'll make some new handles with a B and a G engraved on them just to be sure. Thanks again. Mike

cwf 10-12-2014 05:53 PM

Mike.. new handles? You might have a 'cottage industry' there... you can label one 'poop' and the other 'soup'...

Landrum 10-12-2014 06:51 PM

Couldn't tell if you figured it out, but the handle toward the front of the AS is the black tank. Grey tank is closer to the wheels.

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