We replaced the toilet kit about 6 months ago and now the toilet runs even when the bowl is filled? What can we do to fix it.

There will never be a dripping sound from the bowl unless there is water on the floor indicating a cracked bowl or a gasket has lived its life and needs replacing . The flush kit could drip though, Most likely an indication to adjust the level of the float or perhaps even replace the kit altogether, Never hearing the tank fill up is not related to dripping.

Main 3 (or 4) inch drain under the toilet is clogged. Requires removing the toilet and running a "snake" down the pipe. Alternately, you can (carefully) try manually filling the toilet bowl all the way to the top----to apply pressure to the clog....it may push it through.

first , fixya site dopes not sell anything so you did not purchase from us
next call a service agent or a plumber for problems

Any hardware stores where plumbing supply is sold including lowes and home depot sell toilet seal kits including toilet to tank seals as well as toilet rebuild kits. Ask for a toilet to tank seal and washers for the bolts which might come with the large seal(check)
1. Close toilet water valve
2. Drain tank or sop with a towel and squeeze into tub until toilet is empty or bail water out with a cup.
3. Remove two tank bolts
4. clean area where old seals were
5. put tank seal on bowl and set tank lining it on top of seal.
6. Install tank bolts with new seals and tighten evenly
7. Don't over tighten or tank will crack. You probably can tighten until tank and toilet touch evenly on both sides.
8. Fill and check for leaks.

it is filling up too much you can adjust the arm there is a screw on the side that adjusts the leval of water in the tank

Hello. I have been a plumber longer than I care to remember. In my experience, the common cause of the problem you describe is a hairline crack in the bowl. This is what has to happen to be sure. To check the bowl must be pulled, filled and put up on saw horses. You can then see if there's any leakage from the bowl. good luck with it.

There are cheep fill valves and ther better built fill valves, so make sure you buy aa quality fill valve. Also buy a pressuer gauge at ahard ware store and check water pressure level at a faucet outlet. Screw gauge onto water fauct leave a little room for air to escape when water is drippng out tighten the hose bib on the gage turn on the faucet and read the pressure. If it's more than 50 PSI you need to lower the water pressuer. I need to know if your on a, on site underground well,or are on city water to tell you what you need to do to to fix this problem. If there is one. thanks for using Fix-ya if you want more info post here.
Avid101

Check the fill tube in your toilet one easy way to see if it's leaking is get food coloring and pour in your tank to color the water this makes it easier to see and squeeze the tube in the tank when it's full if you see the colored water running down the middle of it you have a winner! if not you can look around for it sometimes the plastic under the flapper gets cracked too

First off,If the air vent was clogged the toilet would back up and overflow and when it did flush, it would make a gurgling sound.
secondly the water level in the bowl is not important as long as it covers the opening,The water is only there to keep out sewer gases so they don't enter your home and the shape of the trap will always maintain the proper amount of water needed to prevent this.
The previous water level may have been due to a partial clog that has since been removed.