It is very possible that hose going to the tank is kinked. Last month, the hose on our Black tank flusher, popped off. Iunscrewedthe hose attachmenton the outside of our 5vr to reconnectthe hoseand wasable to pull about 10 inches of hose out through the hole in the trailer wall. There is the other possiblity that the hose to thetankis too short , pulled tight and iskinked at thetank end. If your trailer is new, I suggest that youget it repaired under the warranty.
P.S. I saw your query on RV.Net and misunderstood what youwere asking.
Sorry about that.