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Question DetailsAsked on 6/26/2017

my commode is empting on it's own. When i flushed it the bowl filled back up with water as it should.

Got all new parts in my commode. To start with the bowl was filling back up as it should. Then 5-10 minutes later the bowl is empty and will not fill back up. The tank is empty.. What is wrong?

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1 Answer


Hmmm- assuming you have no leak on the floor or underlying floor ???

Bowl flushing and refilling to normal would indicate the tank is filling OK (or mostly so) and the bypass tubing is correctly flowing into the overflow tube to refill the bowl.

Normally, barring a cracked toilet, a bowl refilling properly but then emplying itself is can be due to paper (or string or cloth or such foreign material) draped over the top of the gooseneck inside the toilet (the curved bulge part you see on the side of many toilets) - several flushings or pouring full hot water down it with a bucket (keeping the bowl water level near the bototom edge of the rim as your pour until the bucket is empty) will flush that on down and stop the wicking action draining the bowl.

Another common cause is high winds blowing across the top of the vent stack on the roof or a blocked vent stack. In the first the partial vacuum pulled on the water in the trap causes oscillations in the bowl as the wind gusts, and a progressive dropping of the water level - sometimes to the point of totally breaking the seal in the bottom and letting sewer gases in. In extreme cases or hurricanes/tornadoes it can pull the bowl almost dry. A blocked vent stack can similarly pull the water level down in the bowl also (as well as cause slow draining in opther sinks and tubs, showers) - but does that only when other significant water drainage like toilets, washer, tub/shower are being used.

In either of those cases, the bowl would not refill until it is flushed again - there is no bowl level sensor, it just refills at the end of the flush/refill cycle as the tank is also filling - usually via a small tube from the fill valve leading to the tall round overflow tube in the tank (which flows into the bowl).


Now - assuming we are talking a conventional tank type toilet (not a pressureized unit), if the tank is empty then it is not filling - float or fill valve not working right, or you forgot to turn the water valve below the back of the toilet back on after the repair. Check valve is open - then if waterdoes not start coming into the tank check for a stuck float, or a fill valve not working - if flowing in but not filling then it must be leaking directly into the toilet - due to flapper or flush valve sticking open, or major leakage around the flush valve or overflow standpipe.


If that did not solve it, if a plumber did this callhim back to fix it for free. Otherwise, yoiu can also find other responses to similar questions about toilet malfunctions in the Home > Plumbing link under Browse Projects, at lower left.

Answered 3 years ago by LCD

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