Black tank issue

[taminator]

So we're having trouble with the front bathroom toilet. From day 1 it has "burped" and there is a popping sound when opening the valve to flush, like there is a vacuum built up. And after using for several days it has backed up. We know it's not stopped up due to toilet paper blockage (been there, done that) although at first we thought that was the problem. Ridx did nothing. Snaked it and got the liquid to go down but now it's blocked again. We have a second toilet connected to the same tank and it's working fine.

Any ideas? We have a 2015 415AMP.

[Dave_Monica]

If you have a second toilet connected to the same tank and it works fine, the tank vent must be functioning properly. The only other thing that I can think of it that the drop from the problem toilet into the tank is too long so if the drop is below the liquid level in the tank, it tends to back-up the drop.

Dave

[taminator]

Thanks Dave! We'll be crawling under the trailer tmrw to check things out.

[Blaster 84]

Be sure to keep your mouth closed.

[taminator]

LOL!! For sure!

[Dave_Monica]

I should have noticed when you said two toilets on the same black tank. I can't say that I've ever heard of that. Usually when you have a bath + a half bath, they will have separate black tanks. Looking at the spec for your 415 AMP, it says 108 gal tank capacity and only 45 gal gray capacity. If that's true, they are probably putting gray water from the vanity in the half bath also into that black tank. I'm surprised that there isn't 2 separate gray tanks...one for the galley and the other for the shower/vanity in the full bath. As you're having problems with the full bath black tank, it could be venting on it or some blockage on the toilet drop. The toilet will most likely have a couple of 45 elbows in the drop to line up with the tank and potentially more problems than a straight drop.

Dave

[Herk7769]

Have there been rug rats in your camper? Kids love to drop stuff down the hopper just to see it disappear. You could have a box of Legos or a stuffed teddy bear in there!