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What is the function of a fuel pump?

1 Answers
StDallas
07/29/25 2:22pm
The function of a fuel pump is to draw fuel from the fuel tank, pressurize it, and then deliver it to the fuel supply line. It works in conjunction with the fuel pressure regulator to establish a certain fuel pressure. The fuel pump is a professional term in the automotive parts industry. It is one of the basic components of the fuel injection system in electronically controlled fuel injection vehicles and is located inside the vehicle's fuel tank. The fuel pump operates during startup and while the engine is running. If the engine stops but the ignition switch remains in the ON position, the HFM-SFI control module cuts off the power supply to the fuel pump to prevent accidental ignition. The fuel pump consists of an electric motor, a pressure limiter, and a check valve. The electric motor actually operates within the fuel inside the pump housing, where the fuel lubricates and cools the motor. A check valve is installed at the outlet, and the pressure limiter is located on the pressure side of the pump housing, with a passage leading back to the inlet. Currently, most vehicles use a vane-type electric fuel pump, which offers high fuel delivery capacity, high and stable fuel pressure, low noise, and a long service life. When troubleshooting a fuel pump that has been in use for a long time, it is important not to test it dry. This is because after removing the fuel pump, residual fuel remains inside the pump housing. If there is poor contact between the brushes and the commutator during electrical testing, sparks could ignite the remaining fuel, leading to an explosion.
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What is the fuel consumption of the 2021 Haval 2nd Generation?

The official combined fuel consumption of the 2021 Haval 2nd Generation is 4.7-6.7L/100km. Currently, there are 6 models of the 2021 Haval 2nd Generation available for sale. The combined fuel consumption of the Haval King Rabbit is 4.7L/100km. The Gold Rabbit, Platinum Rabbit, and Silver Rabbit have a combined fuel consumption of 6.2L/100km. The Bronze Rabbit and Copper Rabbit have a combined fuel consumption of 6.7L/100km. The above figures are NEDC combined fuel consumption, which is the fuel consumption data measured under the NEDC test cycle. The actual fuel consumption is higher than this value, ranging from 8.0-8.1L/100km. Methods to reduce fuel consumption: Clean engine carbon deposits: Excessive carbon deposits in the engine are a significant cause, mainly due to the use of unsuitable fuel. It is recommended to add a certain amount of cleaning agent when refueling. If the effect is not noticeable, it indicates a high level of carbon deposits in the engine. In this case, the car must be taken to a 4S shop for professional cleaning of the engine carbon deposits by technicians. Check the oxygen sensor: As an internal control unit of the car, the oxygen sensor mainly monitors the fuel-air ratio in the engine. Once it is damaged, it will cause an imbalance in the fuel-air ratio, leading to a sudden increase in fuel consumption. If the oxygen sensor is damaged, the exhaust pipe will emit darker-colored exhaust gases during driving, and the oxygen sensor should be replaced immediately. Regularly replace the three filters: During vehicle use, the oil filter, air filter, and fuel filter must be replaced regularly. If they are not replaced for a long time, they become dirty and send incorrect information to the engine control unit, resulting in incomplete fuel combustion and increased carbon deposits in the engine. Check the electronic control unit: Although the engine's electronic control unit is highly reliable, in older vehicles, various faults may inevitably occur.
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What does variable speed limit on highways mean?

Variable speed limit on highways is used for roads and expressways to timely remind drivers of their driving speed. The speed limit value can be displayed through the monitoring center based on actual road conditions, thereby effectively guiding traffic flow, promoting driving safety, and improving the transportation capacity of the road network. Maximum speed of vehicles on highways: The maximum speed of small passenger cars on highways shall not exceed 120 kilometers per hour, other motor vehicles shall not exceed 100 kilometers per hour, and motorcycles shall not exceed 80 kilometers per hour. For two lanes in the same direction: The minimum speed of the left lane is 100 kilometers per hour. For three or more lanes in the same direction: The minimum speed of the leftmost lane is 110 kilometers per hour, and the minimum speed of the middle lane is 90 kilometers per hour.
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What Does a Back-House Vehicle Mean?

Back-house vehicle refers to a car that cannot be transferred. Below is a detailed explanation: 1. A back-house vehicle is also an ordinary car, all procedures may have been completed, and annual inspections and insurance are normal, but the transfer of ownership is not allowed. 2. A back-house vehicle refers to a situation where an out-of-town individual spends money to find a local resident with household registration in the city to borrow their ID card for car purchase procedures. 3. Due to legal regulations, out-of-town individuals purchasing used cars in a certain city cannot directly transfer the vehicle under their own name. 4. Before September 2005, China's automobile management regulations stipulated that used cars under local management could not be sold or auctioned in other regions, requiring cross-region transfer registration. The vehicle's exit procedures were handled by the public security traffic management department at the place of origin, and the entry procedures were handled by the public security traffic management department at the destination. Hence, the phenomenon emerged where 'back-car groups' would pay a local resident to borrow their ID card for purchasing a vehicle.
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Do Cars Consume More Fuel in Winter Than in Summer?

Cars consume more fuel in winter than in summer, and the specific reasons are as follows: 1. An engine's optimal working condition requires a certain temperature, generally around 90 degrees Celsius. Only when the engine is in good working condition will fuel consumption be normal. However, outdoor temperatures in winter are relatively low, and after starting, the engine needs a longer running time to reach its optimal working state, leading to increased fuel consumption compared to other seasons. 2. The operation of a car depends on the combustion of gasoline, which inevitably contains some impurities. Over time, these impurities can accumulate on the engine's surface, forming carbon deposits and sludge. This not only damages the engine but can also cause difficulties in starting, high idle speed, excessive exhaust emissions, and more importantly, increases the car's fuel consumption.
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Can I get my car inspected without an ID card?

An ID card is not required for the annual vehicle inspection, so you can have your car inspected without one. Here are some details about the annual inspection: 1. For the annual inspection, you only need to bring your vehicle license and compulsory traffic insurance policy. 2. Before the inspection, you must settle any traffic violations; otherwise, the inspection cannot be passed. 3. During the inspection, your vehicle needs to be driven onto the inspection line, where professionals and specialized equipment will check it. 4. The inspection includes checking the vehicle's appearance, exhaust emissions, chassis, braking system, and lighting system. 5. When inspecting the lighting system, special attention is paid to the brake lights, reverse lights, and turn signals. 6. If your vehicle has any exterior modifications, they must be restored to the original condition before the inspection; otherwise, the inspection cannot be passed. If you fail to complete the annual inspection on time and are caught driving by traffic police, you will be fined and receive penalty points.
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Which Type of Car Transmission is the Best?

DCT (Dual Clutch Transmission) is currently the most widely used transmission. Below is a detailed introduction to various types of transmissions: 1. MT (Manual Transmission): Also known as manual gearbox. It requires the driver to manually shift the gear lever to change the gear engagement inside the transmission and control the clutch engagement with the foot to alter the gear ratio, thereby achieving gear shifting. The gear lever can only be moved when the clutch is depressed. If the driver is skilled, a car with a manual transmission can accelerate and overtake faster than an automatic transmission car and is also more fuel-efficient. The advantages of this transmission are its affordability and the driving pleasure it offers. 2. AT (Automatic Transmission): Uses planetary gear sets and a torque converter for gear shifting, replacing the traditional clutch and freeing the driver's left foot. It determines the optimal gear based on parameters like speed, throttle, and driver commands. Favored by Japanese automakers for its low fuel consumption and economic efficiency, the downside of this transmission is its noticeable gearshift jerking. 3. CVT (Continuously Variable Transmission): Unlike gear-based transmissions, CVT uses a steel belt to connect the input and output shafts, enabling seamless gear ratio changes. This design gives CVT the smoothest shifting performance among all transmissions, along with a simple structure and easy maintenance. However, CVT transmissions have long been criticized for their lower transmission efficiency and inability to handle heavy loads, which can lead to slipping. 4. DCT (Dual Clutch Transmission): As the name suggests, it features two clutches, resembling the combination of two AT transmissions. In a DCT, there are two clutches—K1 and K2. K1 controls gears 1, 3, and 5, while K2 controls gears 2, 4, and 6. During acceleration, the two clutches alternate, making DCT transmissions more efficient in gear shifting. However, they also suffer from gearshift jerking and other drawbacks.
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