Originally Posted by rvpezzano
We are full timers and I never had this issue. I went to back flush the black tank when I was dumping and no water was going through the system.
Way back in March of 2013 the back flow check valve was cracked, so in a pinch, I replace it with an elbow. The system has worked great until now.
I'm about to investigate it but I thought maybe someone might have and thought.
Sure indicates a plugged nozzle in the in tank sprayer. Maybe fouled by a small piece of rubber hose liner. Most can be removed for maintenance. You should reinstall the vacuum breaker when you do repairs. It may save the public near you from a drinking water contamination.
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