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There is a over flow tube that is connected close to the top of the filler neck. It allows fuel to return back to the tank instead of overflowing back out towards you and covers you up with Gasoline. That area could have been in a accident at one time and not been repaired right or a Factory Fault, not likely to be the age of the car.
Check that the fan is working. You do not give a make or model, so it could be the thermostatic switch, fuse or relay for an electric fan or the viscous clutch if it has that type of fan. If the water bubbles out or you see bubbles either in the radiator or the overflow, you might have a head gasket leaking into the coolant system.
The cooling system is overpressurized and is lifting the radiator cap off of its seat at about 14 psi. This will push coolant into the overflow bottle. the most likely reason the system is overpressurized is that combustion gases are leaking past a blown cylinder head gasket into the cooling system. To verify this, you can use a Lisle 75500 combustion gas leak detector kit. it is inexpensive and will show if combustion gases are leaking into the coolant.
May be nothing more than a faulty gas cap or vent hose from the tank to the filler neck. Your charcoal canister for the fuel evaporation system may not be purging. It could be filling up with gas. It will eventually overflow, allowing you to see the problem.
There is definatley a leak elsewhere in the system. The problem does not stem from the resovior or the supply tube. Have a mechanic run a cooling system pressure test to determine the source of the coolant leak.