Leak at water supply into tank.

I've installed a lot of Toto toilets and have had few leaks but, not from the one piece toilets. It might be a problem toilet but, I would be sure the drain is not blocked causing a small back up after the flush.I have seen this happen many times. The toilet can be pulled and a 5gallon bucket of water can be poured down the drain to test this before replacing the toilet. also be sure water is not spraying on the top of the tank lid and leaking down the back of the toilet.If you flush the toilet with the lid off it should be easy to see if that the problem. hope this helps.

Hi, Dayne here
Those large gasket seldom leak unless the two bolts are not tight enough. DO NOT over tighten. The water is probably coming from the bolts themselves. The rubber washer goes on the inside of the tank, and then a nut should be on the outside with a metal washer. Tighten pretty tight, but not too tight.
Thanks.

The ball float follows the tank water level, and repeated cycles of the float dropping and opening the fill valve would likely reflect a leak in the flush valve. You could try adjusting the float arm downward so that it will respond to a lower water level. Try turning off the supply valve, flushing it and listen for water leaking past the flush valve after it closes. If it does, replace the flapper or adjust the chain.

Hello. Your lid has two buttons so you can do a half flush or a full flush. A water saving feature. Since the toilet is flushing by itself every hour or so, you must have a leaking flush valve. Replace the valve to solve that problem. Joe

The rubber stopper that is inside the back of the tank is allowing water to get by do to:
(1.) Be wore out- must be replaced with a new one.
(2.) The chain that is connected to the flush handle needs to be adjusted. However, if it has not been messed with recently, then it will be the (1.)

Jim

WATER LEVEL IS NOT PROPERLY ADJUSTED. REDUCE WATER LEVEL TO FILL LINE

If your hooked to city water it can be cause of the high water pressure comes across and keeps flapper from seating rite. Take a empty plastic bottle,cut it in half long ways. flush toilet then place plastic bottle between fill valve and flapper,trying to devert water away from where flapper seats. good luck.

I have the same problem and can not find a solution. The toilet flushes fine but then a delay in filling up the tank occurs. Is there a part I can replace? Does something need to be cleaned or cleared?

Remove the tank lid and look at the fill valve. Is it a yellow valve?
This fill valve is common on the Toto Toilets and can easliy plug with debrie.

They can be disassmbled and cleaned. however, I usually just replace the valve with Fluid Master Fill valve.
You will also want to check the water coming into the toilet by turning off the water that supplies the toilet and disconnecting the water supply line. After removing the water supply line turn on the water at the valve to make sure that the water is flowing properly. Check the supply line also to make sure it is not plugged.
Be sure and place a small container to catch the water that will come from the valve. A towell will also help from making too much of a mess.
If the Supply line and the valve are clear the problem is in the fill valve.
The G-Max system denotes the Flushiing system which is a 3" flapper that allows the water from the tank to flow into the bowl quicker.
Good Toilets!

sanray

What you are experiencing is a flapper valve problem. Since I don't know what model you have I will give you a link to the generic GMax unit. Here is the parts breakdown for a GMax

Toto GMax

I would suspect you need part #7 on this diagram a flapper valve. Take the old one with you since different colors ones are used on different models. You should go to the Toto site to locate a dealer first. You can find their site here:

Toto USA

Hope this helps and please remember to rate this!