Abstract: A carburetor fuel bowl vent valve assembly consists of a one-piece plastic housing having a central partition with a central well defining a zigzag shaped path for the flow of fuel vapors from the carburetor fuel bowl to a carbon canister. The well contains a vacuum operated vent valve that is spring opened during engine-off operation to allow the storage of fuel vapors under engine hot soak conditions, and is closed by engine manifold vacuum during engine running operation so that the fuel vapors will be rerouted into the engine. The vent valve further includes thermally responsive means to close the vent valve during low ambient temperature conditions. It also includes seal locating means that retain the seal in position without stretching or deforming it.