Why does the car fail to start when the fuel pump is not supplying oil?

2 Answers
FrankLee
07/29/25 4:25am
There are several reasons why a car fails to start when the fuel pump is not supplying oil: Low fuel level: If the car has very little fuel or the fuel gauge shows it is below the red line, it naturally won't start. When you find that the car won't start, the first thing you should do is check the fuel gauge to see if there is any fuel left. Additionally, never wait until the fuel tank is empty before refueling. This not only affects the lifespan of the engine but also the fuel pump. Operating the fuel pump without fuel can even be dangerous. Crankshaft position sensor failure: The crankshaft position sensor is one of the most important sensors in an electronically controlled fuel injection engine, especially in centralized control systems. It is also a shared sensor for both the ignition system and the fuel injection system. The function of the crankshaft position sensor is to monitor the position of the crankshaft, allowing the engine's computer to detect the speed signal. If the crankshaft position sensor fails, the computer cannot detect the speed signal and thus cannot determine whether to ignite, resulting in the car failing to start.
Was this review help?
8
1
Share
AdalineAnn
08/12/25 8:08am
The car won't start, and the fuel pump isn't delivering fuel. I've encountered this issue several times while repairing my own car. The most common cause is a faulty fuel pump motor, which could be due to aging, wear, or power supply issues. First, check the fuse—look for the "fuel pump" label in the fuse box to see if it's blown. If replacing it doesn’t work, inspect the relay, which controls the current flow; if it’s faulty, it won’t supply fuel. Poor electrical connections are also common, such as loose or corroded wiring, leading to unstable voltage. Additionally, a clogged fuel filter can obstruct fuel flow, causing insufficient pressure, so try replacing the filter regularly. Maintaining the fuel system is crucial—neglecting it can lead to breakdowns at critical moments, like during long drives. Pay attention to the fuel pump's sound when starting the car; if there’s no humming noise, it’s likely malfunctioning. Get it checked at a professional shop promptly to avoid further issues.
Was this review help?
9
2
Share
Expand All
More Forum Discussions

How Long Can a Flooded Car Last?

After undergoing repairs, a flooded car can generally last for 3-5 years without issues. Below is relevant information about water entering a car's engine: 1. Precautions for engine water ingress: Do not attempt to start the engine immediately if water has entered the engine compartment. If the car is on a flooded road, push it to a dry area and allow all water in the engine compartment to drain out. Open the engine hood and let the sun dry it or use a blower to remove moisture. In short, ensure the engine is completely dry before starting. 2. Hazards of engine water ingress: Never attempt to restart the engine after water has entered. If you do, even with flood insurance and comprehensive coverage, the insurance company will not compensate. Engines work by igniting compressed gas, and water is difficult to compress. Forcing a start can result in severe damage, such as bent or broken connecting rods, leading to major engine repairs.
17
4
Share

What are the differences between the Magotan and the Passat?

The differences between the Magotan and the Passat are: 1. Different manufacturers: The Magotan is produced by FAW-Volkswagen; the Passat is produced by SAIC Volkswagen. 2. Different body dimensions: The Magotan measures 4865mm in length, 1832mm in width, and 1471mm in height; the Passat measures 4933mm in length, 1836mm in width, and 1469mm in height. 3. Different fuel tank capacities: The Magotan has a fuel tank capacity of 66L; the Passat has a fuel tank capacity of 68.6L. 4. Different vehicle positioning: The Magotan focuses on sportiness; the Passat focuses on business. 5. Different prototype cars: The Magotan's prototype is the European version of the Passat; the Passat's prototype is the American version of the Passat.
8
1
Share

Hangzhou New Energy Vehicle License Plate Requirements?

Hangzhou New Energy Vehicle license plate requirements are as follows: 1. Have a local Hangzhou household registration. 2. Possess a valid residence permit and meet the two-year social security payment requirement. 3. Active-duty military personnel or armed police stationed in Hangzhou. 4. Hong Kong, Macao, Taiwan compatriots, overseas Chinese, and foreigners who have resided for two years with over nine months of cumulative residence each year. 5. Be at least 18 years old and not have a passenger car registered in the city under your name. Additional information about new energy vehicles: 1. New energy vehicles are mainly divided into two types: pure electric vehicles and hybrid electric vehicles. 2. New energy vehicles refer to vehicles that use unconventional vehicle fuels as power sources, integrating advanced technologies in vehicle power control and driving, forming vehicles with advanced technical principles and new technologies and structures.
20
0
Share

What is the tire size of the Audi A3?

The Audi A3 is equipped with two types of tires: 205/55R16 and 225/45R17, depending on the vehicle version. Here is some information about this car: 1. Transmission. The Audi A3 features a MacPherson strut front suspension and a rear axle with a torsion and crank-type structure, with separately arranged springs and shock absorbers. 2. Body dimensions. The new generation Audi A3 is available in four versions: a three-door version, a convertible version, a five-door hatchback version, and a four-door sedan version. The three-door version and the convertible version have a body length of 4260mm and a wheelbase of 2595mm; the five-door hatchback version and the four-door sedan version have a body length of 4440mm and a wheelbase of 2630mm. 3. Exterior. The front face of the Audi A3 still features the familiar Audi family grille design, but with a more three-dimensional hexagonal outline after some modifications.
9
5
Share

What are the regulations for point deductions in Subject 3 lighting test?

Subject 3 lighting test point deduction regulations include: Failure to correctly turn on the lights: 100-point deduction. When following a vehicle in the same direction at close range: Using high beams, 100-point deduction. When passing through intersections: Failing to alternately use high and low beams when passing through sharp curves, slopes, arched bridges, crosswalks, or intersections without traffic signals, 100-point deduction. When meeting another vehicle: Not using low beams as required, 100-point deduction. When passing through intersections: Using high beams, 100-point deduction. When overtaking: Failing to alternately use high and low beams to alert the vehicle being overtaken, 100-point deduction. On well-lit roads: Using high beams when driving on roads with streetlights or good lighting, 100-point deduction. When temporarily parked at the roadside: Failing to turn off headlights or turn on position lights, 100-point deduction. On poorly lit roads: Failing to use high beams when entering roads without lighting or with poor lighting, 5-point deduction.
4
0
Share

How to Use the Air Conditioning in Geely Emgrand GL?

Geely Emgrand GL air conditioning usage method is mainly as follows: 1. After starting the vehicle, press the AUTO automatic air conditioning button. 2. Rotate the ACMAX button to adjust the temperature, turning clockwise to increase the temperature. 3. When the temperature is higher than the interior temperature, the warm air will be activated. 4. If cooling is needed, press the AC button. Additional information: The Emgrand GL air conditioning adjustment area functions as follows: 1. Temperature adjustment: Rotate the temperature adjustment knob clockwise (for heating) or counterclockwise (for cooling) to set the desired temperature. 2. Fan speed adjustment: Rotate the fan speed knob clockwise (to increase) or counterclockwise (to decrease) to adjust the fan speed. 3. Press the middle defrost button to heat and defog the windshield and front side windows. 4. Turn the fan speed knob to 0 to turn off the fan.
3
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.