???? Why? It shouldn't pour over either side,should it?
First, the valve float must be shot if it isn't turning the water off at
all. Second the overflow must be blocked if the water can't flow out thru
it fast enough to prevent it from completely filling the tank and flowing
onto the floor.
Depending on the make of the toilet you can buy re-build kits that should
solve the float/valve problem, and perhaps a new overflow as well. Take a
close look at what your parts look like and then head to the hardware store
or plumbing supply shop and see what they have the looks similar.
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