Es300, GS300, GS400

Ensure line connector is clean. Disconnect fuel line connector as illustrated. See Fig 1 or Fig 2. If connector and line are stuck, pinch retainer, push and pull connector to free. DO NOT use tools to disconnect connector. After disconnecting, ensure seal surface is clean. Cover connector with plastic, to prevent damage.
When removing retainer from fuel line, replace with new one. Apply small amount of engine oil to fuel line tip for easier installation. Push connector and retainer together until a click sound is heard. Ensure connection is secure by pulling on connector. Start engine and check for leaks.

Fig 1: Disconnecting Fuel Line Quick Connector (ES300)

Fig 2: Disconnecting Fuel Line Quick Connector (GS300 & GS400)