Rollover Valve: Description and Operation

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Chrysler built passenger cars pass a full 360° rollover without fuel leakage. To accomplish this, fuel and vapor flow controls are required for all fuel tank connections.

On vehicles equipped with a return line from the fuel pump to the fuel tank, a one-way check valve is used to provide the required protection. In addition to the valve, improved flow control is used in the fuel pump to control flow when the pump is subjected to the higher than normal pressure which can occur during rollover. A fuel filler cap with a higher pressure setting is used for the same reason on vehicles with side fill.