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Excess evaporated gasoline vapor pressure is usually directed through the vapor hose to the black cannister, that, on 240s, is mounted to the car left side bumper shock plate metal housing in front of the car left side front tire, in front of the fender well insert.
Also, it is suggested you do not ever remove the cap from the expansion tank where the coolant is at a normal expansion tank level with a hot engine and coolant. Embolisms can form inside the coolant jacket (engine-cylinder head / top of radiator) and the coolant may be hot enough, more so if the coolant mix is more than 50/50 in favor of water (distilled, demineralized, deionized, never TAP water, unless an emergency), coolant may boil up and over with loss of pressure cap seal.
Else, one should worry if the system become immediately pressurized, and bleeds off pressure, when starting a cold engine from a long over night sit. As you can tell by the upper radiator hose feel. Suspect cylinder compression leak into the coolant jacket. Warped head / cylinder head gasket leak.
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