Toilet bowl is filling almost all the way up when flushed, then flushes fast and stays almost empty. I put dawn in it and poured hot water into it. I read to fill it up with hot water to the rim and then flush. Before pouring all the water in, it flushed on its own. I poured more hot water in and it did it again. All are fast flushes. The refill stage still leaves the bowl almost empty.
Toilet bowl overfills before flushing, then stays drained
toilet
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Best Answer
The flushing action appears to be working normally. A toilet flushes because the water level reaches the vertical level inside the covered portion of the bowl.
The refill portion is possibly because the tube that is inside the tank has become dislodged. Remove the cover and look for a small diameter tube, perhaps pencil diameter that now has a loose end. There will also be a larger diameter vertical tube to which this smaller tube attaches. The clip will be on either tube and they should be joined to allow the flow from the smaller tube to reach the bowl, completing the refill.
From https://www.handymanhowto.com/how-to-replace-a-toilet-fill-valve-part-4/