Just installed the Fluidmaster 400ARHRK (http://www.fluidmaster.com/our-products/toilet-fill-valves-toilet-parts/400arhrkp10-performaxr-all-in-one-toilet-repair-kit.html) and we still have a slow leak of about 1/2" in the tank. Can't figure it out. The water in the tank drops about 1/2" maybe every hour or so. The tank refills to the proper level. Then it will drop again 1/2". Repeat.
You can see the discrepancy in the water level in the photo below, the tank has lost water about 1/2".
When I shut off the water supply to the tank the tank looses more water but doesn't empty.
There are no leaks onto the floor, on the outside of the tank or anything like that.
There is plenty of slack in the the flapper chain. Flapper fits snugly. The kit came with a new rubber gasket as well.
I saw this on another forum, which is what we are experiencing: "If it drains down to a certain point and stops, then you have the small refill tube stuck too far down into the overflow pipe." But in our case the refill tube sits above the overflow pipe - see photo below.
We don't see any pieces of the old flapper or any "debris" that could be stuck somewhere to cause the tank to lose water. We are thinking of disassembling and starting over but can't see that helping.
Not sure if this makes any difference, I turned off the water supply from the house to the tank this morning and at lunch the tank is totally dry. Does this help me at all?
So I know the water is leaking into the bowl and not the floor/outside the tank.
Should I still do the dye test? Will that pinpoint where the leak is occurring (flapper, overflow pipe, seal beneath flapper)? Or does the dye test just show you it's leaking into the bowl (which I already know)?
They sell a seal of sorts I see that you put on top of the thing that the flapper lid (I think) closes down on that is supposed to maybe help flapper leaks. Should I get this?
I just know if I will be able to determine from where the leak is occurring...?