What is the principle of the fuel nozzle auto-shutoff?
1 Answers
The principle of the fuel nozzle auto-shutoff is: when the fuel tank is full, the air vent of the nozzle gets blocked, creating a negative pressure inside the nozzle's self-control membrane. This, in turn, causes the ball bearing and switch to disengage the nozzle's support plate, leading to the valve closing and the nozzle auto-sealing, resulting in the auto-shutoff. The reasons for the fuel nozzle auto-shutoff are: 1. Blockage or poor fuel flow in the fuel line; 2. The vent pipe next to the fuel filler neck is blocked or deformed; 3. High pressure inside the fuel tank due to hot weather, causing fuel to splash out easily during refueling; 4. Relatively fast refueling speed, leading to fuel splashing and triggering the auto-shutoff; 5. The fuel pipe structure in the fuel tank is too tortuous.