Thor Forums

[SuperD]

Originally Posted by DLM1965

We have a 2017 Quantum PD31 with the same kind of toilet problem. Never worked since we bought the unit March 2017. The dealer replaced a vacuum seal one time, but no change. We have NEVER put solid waste down the drain because of this problem - just liquids. When flushing, in about 4-6 seconds the liquid backs up into he toilet bowl and liquid leaks onto the floor below. Trying to get it scheduled back in for another try at repairs, so interested in all the advice I can find. I carry a 3-foot snake, and with a few jabs, suddenly everything flows right down, sort of like when a vapor lock releases.

Sounds like you “might” have a blocked vent pipe. If you can, get on the roof and remove the black tank vent cap. Check to see if the cap is plugged and not allowing the tank to vent when flushing. While you’re at it I would replace the factory cap with a 360 vent cap, you can get them from Amazon. You’ll need some Dicor self leveling sealant and a pipe cutter, takes less than 30 minutes to do the job.

Here are pictures of the 360 cap and the factory cap: