Blackwater tank flush inlet

[jordandvm]

I recently completed RT from Oregon to Kansas over 30 days. The last week of the trip, the blackwater tank flush would not work. I hooked up the hose, turned on the water, and no water would enter the tank. Previously I had a quick disconnect attached to both the BW flush inlet and fresh water inlet. Once (actually twice ) I inadvertently hooked up what I thought was the fresh water supply hose and almost overflowed the BW tank! So I took off the quick disconnect to the BW inlet to prevent getting it mixed up with the fresh water connection. I purchased a pressure valve to use on the fresh water connection on the advice of one of the RV parks where we stayed. I haven't been using it on the BW flush connection. Should I use the pressure valve on the BW flush tank inlet too? I'm afraid I may have screwed up something in the BW inlet with the high pressure! Have any of you experienced problems with your BW tank flush? Is there something I could try before I take it to the dealer (it's still on warranty)?

[jordandvm]

OK, I know this isn't the most exciting topic....but when you are at the dump station, people are waiting!!!!!!!!!! And dang, the tank won't flush!!!!!! Whaddo I do now? It can be frustratin!

[john hd]

some one else with a newer trailer had the same problem, do a search with the words "black tank flush" in the subject line.

i believe it was kimli, but i am not for certain on that.

there is a vaccum breaker in the flush line to prevent back flow into the fresh water system. it may be in the closet or behind trim in the bathroom. they are usually mounted near the cieling with a u shaped run of pipe to aid in breaking vaccum. mine is behind a curved moulding in the bathroom.

if the vaccum breaker were to become stuck it could prevent water flow.

perhaps you could try some compressed air on the line.

john