A method of operation of a navigation system includes: identifying a device location; selecting a maneuver type with the device location; and determining a junction-type with the maneuver type for displaying on a device. The two nodes are connected to the respective inputs of a comparator. A second node is located between the first and second resistors RS1 and RS2. When the fuel in the tank reaches a full level, the float moves upward to close the recirculation line and the canister line substantially simultaneously.