Sewer flush port

[tadam]

Our sewer flush port is no longer working. When I connect the water supply to it and turn on the water, it spews it back out. How in the world could this port get clogged up?

[Ste14mi]

I'll be interested in the reply to this too. Same problem just came up on our 2017 Pinnacle FBTS.

Tadam - Are you getting burping/bubbling from the toilet also? I am wondering if my vent stack for this black tank is possibly blocked which might account for both these symptoms.

[dzwiss]

Mine clogged up two different times. The first time I used half a box of TSP disolved in a couple of buckets of hot water, then filled the tank 3/4 full and drove a few hundred miles. That did the trick. It hadn't been working for a few months. The second time I used dishwasher detergent, which also worked.

[WyEm]

The vacuum breaker check valve may be stuck.

[BigJohnD]

I had one do that before. Turned out the dissolved tp had worked its way into the jets and formed a plug. Pulled the whole jet assembly and cleaned. All good after that. Only happened once.

If the vacuum breaker check is stuck in the wrong position, you'd have a flood inside your rv. I get rid of them and use an inline external one. Have for years, due to every stock one I had leaked under a cabinet or in a wall.

[tadam]

Originally Posted by Ste14mi

I'll be interested in the reply to this too. Same problem just came up on our 2017 Pinnacle FBTS.

Tadam - Are you getting burping/bubbling from the toilet also? I am wondering if my vent stack for this black tank is possibly blocked which might account for both these symptoms.

I am not getting any burping/bubbling from the toilet.

Just another check item on the list for things to fix while it's under warranty.