Browse

Antiques Collectibles Apparel Baby Kids Items Books， Movies And Music Electronics Free Stuff Garden Outdoor Health Beauty Home Goods Home Improvement Supplies Musical Instruments Office Supplies Pet Supplies Sporting Goods Ticket Toys Games Transportation Others

Used Cars New Cars Others

Business Crafts Design And Web Events Home Improvement Legal Lessons Personal Pets Photography Repair And Technical Support Wellness Writing， Translation， And Transcription Others

Activities & Groups Artists & Musicians Classes & Lessons Events Friendship & Networking Lost & Found Rideshare Sports Teams Volunteers Travel & Travel Partners Skills & Language Swap Other

Does the automatic shutoff of a car's fuel tank mean it's full?

1 Answers

LaAndres

07/30/25 2:07am

When a car's fuel tank automatically shuts off, it indicates that the tank is full. Nowadays, gas stations commonly use self-sealing fuel nozzles, which automatically trip when the tank is full. These self-sealing nozzles feature an independent, sealed pressure-sensing system integrated with the nozzle body. When the main valve of the nozzle is opened, allowing high-speed fuel flow through the return valve, the unique structural design of the return valve assembly creates negative pressure within the pressure-sensing system. Under normal operating conditions, this negative pressure is continuously balanced by air replenishment through a vent tube located inside the fuel outlet pipe, maintaining a state of equilibrium in the pressure above and below the sensing diaphragm. However, when the fuel level rises to cover and block the vent tube opening, the negative pressure in the sensing system rapidly increases. This disrupts the pressure balance on either side of the diaphragm, causing it to move toward the negative pressure side along with the switch mechanism, thereby disengaging the nozzle latch. As a result, the fuel nozzle completes its self-sealing shutdown action within 0.3 seconds.

Was this review help?

18

1

Share

More Forum Discussions

Is Lower Engine Temperature Always Better?

Engine temperature is not always better when lower. Here are some key points about engine temperature: 1. When engine temperature is too low: (1) Excessive heat dissipation from cylinder walls reduces gas pressure in cylinders and thermal efficiency, leading to increased fuel consumption. (2) Poor fuel evaporation and atomization results in over-rich mixture and incomplete combustion, increasing fuel consumption. (3) Unburned gasoline enters the crankcase, diluting lubricating oil and accelerating component wear. (4) Low temperature increases lubricant viscosity, reduces fluidity, worsens lubrication, and accelerates bearing wear. 2. When engine temperature is too high: (1) Affects lubrication as high temperature thins oil film, increases friction, and accelerates engine wear. (2) Causes excessive expansion of metal and rubber components, accelerates rubber aging (may even cause direct failure), and creates compression between matched metal parts leading to damage.

What kind of engine oil does Geely Emgrand use?

Geely Emgrand uses 10W-30 engine oil. When the temperature is below 0°C, SAE5W-30 can be used instead. Below are specific methods for selecting engine oil for cars: 1. Performance selection: If you prioritize the long-term effectiveness of the oil, you can choose Mobil oil; if you focus on the oil's cleaning effect on the engine, you can use Shell lubricants; if you need lubricants with strong oil film toughness, it is recommended to use Castrol. 2. Driving conditions: For frequent driving in congested areas, older vehicles, or long-distance heavy-load transportation, the viscosity of the lubricant can be appropriately increased. 3. Engine type: For naturally aspirated engines, mineral oil and semi-synthetic oil can be used. Compared to naturally aspirated engines, turbocharged engines have a more compact structure and operate under harsher conditions, requiring higher-grade lubricants with better fluidity, preferably fully synthetic oil.

Is Brilliance Auto a State-Owned Enterprise?

Brilliance Auto is a state-owned enterprise. Below is relevant information about Brilliance Auto. 1. Introduction: Brilliance is an enterprise with legendary status and the founder of a new model for Chinese independent brands. The group is currently involved in fields such as complete vehicles, new energy, and intelligent manufacturing. 2. Brands under its umbrella: It owns three independent brands—Zhonghua, Jinbei, and Huasong—as well as two joint venture brands, Brilliance BMW and Brilliance Renault, with products covering the entire range of passenger and commercial vehicles. 3. R&D model: Adhering to an R&D model of 'self-reliance supplemented by external cooperation,' it collaborates with internationally renowned companies such as Toyota of Japan, BMW of Germany, and Porsche, forming its own intellectual property and possessing 148 technology patents.

What Needs to Be Done After Picking Up a New Car?

After picking up a new car, the following items need to be completed: 1. Purchase insurance: Buy full coverage insurance immediately for the first year, as it takes effect the next day. 2. Pay vehicle purchase tax: Pay the required tax for the vehicle. 3. License plate registration: Register the license plate and add some decorations such as window tinting, floor mats, seat covers, etc. 4. Break-in period: During the break-in period, avoid sudden acceleration and hard braking. The same applies for long-distance highway driving—try to maintain a steady speed, keeping the engine RPM between 3000-4000. Avoid exceeding 4000 RPM, or if it does, keep it at that level for only a few minutes. These practices are beneficial for the break-in of the new car.

What to Do When Feeling Nervous During a Driving Test?

Feeling nervous during a driving test is a normal phenomenon, and it can be effectively regulated through various methods. Here is a detailed introduction to the methods for regulating nervousness during a driving test: 1. Boost confidence: Before the test, give yourself more psychological encouragement to increase confidence. Face the test in a relaxed state. 2. Reduce psychological pressure: Calm your mind and clarify your goals. Alleviate your psychological pressure and ease nervous emotions. 3. Make adequate preparations: Familiarize yourself thoroughly with the route and other aspects before the test. When in doubt, ask the instructor. For areas where you are not proficient, increase practice. 4. Others: Vent inner tension through methods like listening to music, running, or shouting, and actively seek effective ways to regulate your emotions.

What is the most suitable engine oil for the Sagitar 1.6?

The Sagitar 1.6 engine is more suitable for using 5W-40 semi-synthetic or fully synthetic oil. Below are the specific details about the Sagitar: 1. Vehicle Positioning: The Sagitar is a joint-venture A+ class sedan brand under FAW-Volkswagen, a compact car from Volkswagen. 2. Configuration: The entire series comes standard with integrated high/low beam LED headlights. High-end models feature a grille ambient light design, MDFS intelligent dynamic headlight assist system, and AFS headlight cornering system. 3. Interior: The interior combines soft-touch materials and piano black lacquer panels. High-end models are equipped with a 10.2-inch Active-Info-Display instrument panel and an 8-inch multimedia screen, angled toward the driver's side, supporting Apple Carplay connectivity. Base models do not include a multimedia screen, and the air conditioning panel uses touch-sensitive buttons. Mid- and low-end models feature traditional mechanical pointer instrument panels.

Trending Ranking

What are the reasons for the car not moving when the gear is engaged?

What to Bring for Driving Test Part 3?

When driving, should you press the clutch or the brake to slow down?

What are the high-end car brands from South Korea?

Where is the Teana water temperature gauge?

What Causes the Striped Marks on Power Window Glass?

What does TCU mean in a car?

Can You Directly Add More Engine Oil When It's Low?

Why is the truck not consuming urea?

What are the benefits of multi-point fuel injection?

More Forum Discussions

How Many Liters of Transmission Fluid Does the Mazda6 Require?

What are the differences between new energy vehicles and conventional vehicles?

Where is the trunk switch of the Honda Elysion?

Will traffic police check modified headlight lenses?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.