Black Water tank sprayer

[Wheelhouse]

Black water tank sprayer?? Does anyone have an idea where it is located? I have a 2007 3500RL. I followed the line to behind the sliding door wall where the anti-suphin valve is located. Couldn't follow it to the black water tank. I think the sprayer is clogged or corroded? Not enough water spraying the tank??

[bncinwv]

I believe you will have to drop the belly cover for access to the black tank and the sprayer.
Bingo

[DQDick]

Usually if the black tank flush isn't working correctly the problem is in the back flow preventer. It's usually either in the wall behind the shower or under the sink in the bathroom. It's a cheap plastic part that does fail at times.

[Wheelhouse]

Thank you. I will check the back flow preventor first. Hopefully that is it. I'll let you know.

[NCFischers]

That was the problem with mine.

[Wheelhouse]

I found and removed the in-line air gap, and replaced it with a 90 degree elbow. Went to the hose connection for the sprayer and replaced it with a one way check valve. It turns out the hose connection on the coach is without the check valve. The RV center said the check valve does the same thing as the anti-syphin valve which is a special order item. Now to check for leaks when I dumpp the black water tank and work on the black water dump valve. Lucky me, lol.
Day 2---- I traced the water line to the anti-syphin back to the water service manifold and it dropped under the belly to the other end of the blackwater tank. Wow, what waste of tubing. No way of accessing it from above. Dropped belly liner and finally found the sprayer. It is lodged between the tank and the trailer I-Beam with about 6" between. I am going to take off the water line and try to use a ratchet with a screw tip to remove the sprayer. I'll let you know how it goes.