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What are the symptoms of a damaged fuel pump?

1 Answers
PresleyRose
07/29/25 3:04pm
When a fuel pump is damaged, it can exhibit the following symptoms: 1. The fuel supply system fails, making the vehicle unable to start; 2. There is no residual pressure, and the fuel pressure cannot reach the specified value; 3. The atomization effect is reduced, causing difficulty in starting; 4. A buzzing noise is heard while driving; 5. The engine malfunction light turns on; 6. The engine experiences abnormal shaking. The function of the fuel pump is to draw gasoline from the fuel tank and deliver it through the pipeline and fuel filter to the float chamber of the carburetor, allowing the fuel tank to be positioned away from the engine at the rear of the car and below the engine. Depending on the driving method, fuel pumps can be categorized into: mechanically driven diaphragm type and electrically driven type.
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More Forum Discussions

What's the difference between 91V and 91H tires?

The difference between 91V and 91H tires lies in their speed ratings. 91 is the load index, indicating the maximum load capacity the tire can bear under different air pressures. A 91-rated tire can support 615KG at 2.5Bar. V and H are speed symbols, representing the maximum speed the tire can sustain: V=240km/h, H=210km/h. Here are the related details: 1. "65" is the aspect ratio of the tire, which is the ratio of the tire's height to its width. Here, it means the height is 65% of the width. The smaller the number, the flatter the tire appears. 2. "R" refers to the tire's construction, indicating that this is a radial tire where the cord plies are arranged radially in the tire body. 3. "B" indicates a bias-ply construction. Currently, bias-ply tires for passenger cars are no longer in use. 4. "15" represents the rim diameter in inches. This tire must be matched with a 15-inch rim; otherwise, it cannot be installed. 5. "89" is the load index: the maximum load capacity for this tire is 1,279 pounds. Different load indices correspond to different maximum load capacities.
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Does a small card falling into the car window gap have any impact?

A small card falling into the car window gap can have an impact. The specific details are as follows: 1. If the card falls inside the car door, removing it will require dismantling the door's interior panel. It's common to see people distributing small cards placing them in the gap between the car door and the window glass. Before lowering the window, car owners must remove the card; otherwise, it can easily fall inside the door. 2. There are drainage holes inside the car door. If a card blocks these drainage holes, it can lead to more serious malfunctions. Therefore, if a card falls inside the door, the interior panel should be removed immediately to retrieve the card. If the card gets stuck between the door and the window glass, it can cause scratches on the glass surface, slow down the window's movement, or even lead to jamming issues.
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Should New Car Tires Be Installed on the Front or Rear?

Here is the relevant introduction about whether new car tires should be installed on the front or rear: 1. First, it depends on the vehicle's drive characteristics: front-wheel-drive cars should replace the front tires, while rear-wheel-drive cars should replace the rear tires. Front-wheel-drive cars require higher grip from the front tires. If the front tires lack sufficient grip, accidents are more likely to occur, so new tires should be installed on the front wheels for front-wheel-drive cars. For rear-wheel-drive cars, the rear tires are prone to skidding or even rolling over on slippery roads or during sharp turns, leading to accidents. Therefore, new tires should be installed on the rear wheels. 2. Second, it depends on the driving environment: If you frequently drive in urban areas with good road conditions and low speeds, the likelihood of fishtailing is minimal. Instead, the probability of steering loss due to front tire blowouts or skidding is higher. Conversely, if you frequently drive on highways, the chance of fishtailing caused by newer front tires will likely exceed the risk of a blowout. If you often drive in the city, new tires should be placed on the front wheels, whereas if you frequently drive on highways, new tires should be installed on the rear wheels.
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What are the symptoms of a faulty transmission valve body?

When the transmission valve body is faulty, the transmission warning light on the dashboard will illuminate. Symptoms may include the vehicle not moving when shifted into reverse, occasional failure to move in drive gear, jerky gear shifts, and the vehicle lurching during operation. Here are detailed symptoms of a faulty transmission valve body: 1. The transmission contains electronic components such as oil temperature sensors, speed sensors, and solenoid valves. When a fault occurs, the computer can detect it, triggering the warning light and putting the transmission into a locked gear state or protection mode. 2. While driving, when accelerating, you may only hear the engine revving without noticeable speed increase, experiencing poor acceleration and low power output. This is due to reduced transmission efficiency caused by a faulty valve body. 3. During operation, you may feel noticeable jerking or shaking during gear shifts. This could be due to excessively high transmission oil temperature, internal contamination, or valve body clogging, leading to transmission jerking. Please visit a 4S store or repair shop for inspection and maintenance.
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What are the reasons why a car cannot start?

The reasons why a car cannot start are as follows: 1. Dead battery: Sometimes when you wake up in the morning and find that the car cannot start normally, it is likely that the trunk was not completely closed, causing the trunk light to stay on and drain the battery. 2. Spark plug failure: Spark plugs are prone to damage, and short circuits in high-voltage lines can prevent them from igniting. Another reason is that poor-quality spark plugs can also cause the car to fail to start normally. 3. Starting circuit malfunction: When starting, there is only a slight "click" sound and no further response, which is caused by a stuck starter relay. In this case, simply press the tail of the solenoid to force it forward, which will connect the starting circuit and allow the engine to start.
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What are the effects of changing from 55 tires to 60 tires?

Changing from 55 tires to 60 tires increases the aspect ratio of the tires, which affects grip, acceleration performance, braking distance, comfort, handling, and fuel consumption. Below are the specific details of changing from 55 tires to 60 tires: 1. The advantages of changing from 55 tires to 60 tires are that the longer sidewalls and increased tire height improve ground clearance, and the higher aspect ratio makes the tires thicker, enhancing vibration absorption and comfort while saving fuel. However, the disadvantages include reduced road feel due to the thicker tires, weaker lateral resistance during turns, poorer handling, and slightly diminished acceleration performance. 2. When changing from 55 tires to 60 tires, it is essential to ensure that the modified specifications are as close as possible to the original specifications in terms of outer diameter, with a difference not exceeding 3%. Otherwise, the tires may interfere with the fenders or other components during turns, posing safety risks. 3. Generally, it is not recommended to change from 55 tires to 60 tires because the original aspect ratio of the car's tires is determined through a series of factory tests to be the optimal ratio for the vehicle's performance. Altering the aspect ratio may lead to issues such as inaccurate odometer readings or ABS malfunctions.
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