What Causes the Fuel Nozzle to Auto-Stop?
2 Answers
The reasons for the fuel nozzle auto-stopping are: 1. There may be a blockage in the fuel line or poor fuel flow; 2. The vent pipe next to the fuel filler neck is blocked or deformed; 3. Hot weather causes higher air pressure in the fuel tank, making fuel prone to splashing out during refueling; 4. The refueling speed is relatively too fast, causing fuel splashing that triggers the auto-stop; 5. The fuel tank's pipe structure is too convoluted. The auto-stop refers to the action where the fuel nozzle automatically stops when the car is nearly full at the gas station. The fuel nozzle tip is equipped with a sensor - once this sensor contacts the fuel surface, the nozzle will automatically shut off. This auto-stop action does not affect the actual fuel quantity.
The fuel nozzle automatically stopping is actually a normal protective mechanism, designed with a small hole at the top and an internal valve. When the nozzle is inserted into the fuel tank opening, sensors detect the fuel level; once gasoline reaches that point, it triggers the valve to close and automatically stops. This is called overflow protection, preventing fire risks or environmental pollution caused by fuel spillage. I often encounter this situation, especially when refueling is nearing completion, indicating the tank is almost full. If it stops too quickly, it might be due to an unsteady nozzle insertion or air bubble interference. Remember not to rush while refueling and keep the nozzle vertical to minimize misoperation. In summary, this is a safety feature, not a malfunction. Always ensure the fuel cap is properly secured before driving to avoid repeated issues.
