Is the small tube from the inlet to the overflow tube in place? Sometimes the gasket in the top of the fill valve will go bad and let it spray out of the top.
The smaller end of the cone goes up into the tank.
check that the toilet stopper has been switched on and check that the strainer inside the toilet inlet is clear of debris
Toilet tank
Water head is the vertical height of inlet of water supply from the bottom of the storage tank to the inlet of the Cistern.
Each flush of a toilet uses the same amount of water.
A vacuum breaker is a device that prevents water in a toilet cistern or water tank, from syphoning back into the toilet cistern or water tank.
seal to stop water from runing into tank located between tank and bowk
There are main five reasons for your toilet does not flush. Clogged in the toilet Poor/defective pipe Quality tank water level is low. Damaged flapper Inlet holes blocking These are the most common problems, you can check these one by one and solve your solutions.
In this case the only proper thing is to get a new bladder tank.
Install a tempering valve in water line feeding toilet. Tempering valve will mix hot and cold water together so warm water fills toilet tank which will stop condensation.
Take cold inlet water pipe off tank. The dip tube sits below the fitting joining to the tank on the cold inlet side. You can pull it out and replace it.
It's the Rubber seal at the bottom of your water tank, when you flush the rubber seal raises and the water flashes your toilet. Generally its black but not always.