What would be the reason for allowing an expansion volume and a venting system in the fuel tank?

Cars & Vehicles

Closed-loop, or sealed, fuel systems require that fumes from the gasoline be vented back to the engine for burning. A bad, or "open" vent valve can cause the car to stall when, or immediately after, filling up the gas tank. Because of temperature variances, combined with being a sealed unit, expansion areas must be designed into the tank to allow for gases to expand prior to be sent to the engine.

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