Hi, I am hoping you can help me troubleshoot a problem I am having. 
The initial symptom was water leaking when the toilet was flushed: the water was leaking only when the toilet was actually being flushed, and a small amount of water would dribble from between the water tank and the body of the toilet onto the floor. This led me to believe the gasget needed to be replaced.
That is the symptom currently still, after I have replaced the following with brand new parts:
* A new gasket. (between the water tank and the main body of the toilet)
* A new fill valve (a Fluidmaster 400a, same as was previously installed)
* All new tank nuts, bolts, and rubber washers.
* A new flush valve.
There are no other symptoms present. Water is not leaking inside the toilet. Water is not running in the toilet. I replaced the other parts as they were older, to stave off any future problems from developing.
I have tried two different types of gaskets, but the other type of gasket was too high/tall and did not appear to be the right fit. This one seems like the right fit and my local hardware shop that has been very good with helping me with DIY repairs showed me a third choice, and the third one would have been too thick also. I think I have the right gasket.
I tightened everything down as much as I could ...
What could I have missed?
I took it apart four times and reassembled four times. Cannot find what I am doing wrong.
I do not know the make and model of this toilet, other than it was circa around 1986 when my home was built. There is nothing legible inside the toilet tank, no legible stamp to make out, so we went by the shape of the opening, the old gasket, and by photos of my toilet and the hole where the gasget had been to pick a new gasget. The old gasget was very deteriorated and compressed from its original shape, so it was difficult to picture what it must have originally looked like.
I read somewhere that sometimes gasgets need to be sealed with pressure. I did not seal this one with pressure. I fitted it onto the end of the flush valve, then placed the porcelain tank in position on the body of the toilet.
Thank you in advance for any insight or ideas.
The initial symptom was water leaking when the toilet was flushed: the water was leaking only when the toilet was actually being flushed, and a small amount of water would dribble from between the water tank and the body of the toilet onto the floor. This led me to believe the gasget needed to be replaced.
That is the symptom currently still, after I have replaced the following with brand new parts:
* A new gasket. (between the water tank and the main body of the toilet)
* A new fill valve (a Fluidmaster 400a, same as was previously installed)
* All new tank nuts, bolts, and rubber washers.
* A new flush valve.
There are no other symptoms present. Water is not leaking inside the toilet. Water is not running in the toilet. I replaced the other parts as they were older, to stave off any future problems from developing.
I have tried two different types of gaskets, but the other type of gasket was too high/tall and did not appear to be the right fit. This one seems like the right fit and my local hardware shop that has been very good with helping me with DIY repairs showed me a third choice, and the third one would have been too thick also. I think I have the right gasket.
I tightened everything down as much as I could ...
What could I have missed?
I took it apart four times and reassembled four times. Cannot find what I am doing wrong.
I do not know the make and model of this toilet, other than it was circa around 1986 when my home was built. There is nothing legible inside the toilet tank, no legible stamp to make out, so we went by the shape of the opening, the old gasket, and by photos of my toilet and the hole where the gasget had been to pick a new gasget. The old gasget was very deteriorated and compressed from its original shape, so it was difficult to picture what it must have originally looked like.
I read somewhere that sometimes gasgets need to be sealed with pressure. I did not seal this one with pressure. I fitted it onto the end of the flush valve, then placed the porcelain tank in position on the body of the toilet.
Thank you in advance for any insight or ideas.