Originally Posted by ibra0078
I been reading stories where the black tank flush will eventually leak over time. I want to prevent it from happening and wondering if anybody has instructions of how they did the mod. If I'm not mistaken the flush valve is split and that value that Jayco uses is pretty cheap. So instead they run it straight into the black tank. Just trying to get more information of how it was done.
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First understand that there is some controversy to the mod. I simply removed the flush valve [vent] and reconnected the plumbing so that the flush shoots directly into the tank. The valve is there Ive been told to provide a vacuum break and to prevent potentially syphoning back out of the flush fill connection.
My flush valve was defective and diverted incoming water back out the vent resulting in flooding inside the TT. It is not supposed to do that as a ball is designed to block the vent and open the flow into the tank but the failure I experienced is apparently fairly common. Its an easy mod, just a little awkward working under the bathroom sink cabinet.
After the mod, you connect the water line to the flush input on the side of the trailer and turn on the water. When done, shut off the water and dump.
Syphoning will not occur if the flush connection is higher than the top of the black tank. You can also protect things by turning off the water and then slowly loosening the connection of the line to "vent" pressure from the line before completely removing the hose.