How to check petrol pump
The gasoline pump is a core component in a car's fuel system, responsible for delivering fuel from the tank to the engine. If the gasoline pump fails, it may cause problems such as the vehicle being unable to start, lack of power, or reduced fuel efficiency. This article details how to check your gasoline pump and provides structured data to help you quickly diagnose the problem.
1. Common fault symptoms of gasoline pumps
Before checking the gasoline pump, you first need to understand its common fault symptoms. The following are typical symptoms of a gasoline pump failure:
| Symptoms | Possible reasons |
|---|---|
| Vehicle cannot start | Complete failure of petrol pump or power supply problem |
| Engine power is insufficient | Gasoline pump pressure is insufficient or partially clogged |
| The fuel gauge displays abnormally | Fuel pump sensor failure |
| fuel leak | Damaged petrol pump seal |
| Engine stalls intermittently | Poor contact in gasoline pump circuit |
2. Steps to check the gasoline pump
The following are detailed steps to check the gasoline pump to help you quickly locate the problem:
1. Preliminary inspection
First, make sure there is enough fuel in the tank. If there is not enough fuel, the gasoline pump may not work properly. In addition, check whether the fuses and relays of the fuel system are normal.
2. Listen to the petrol pump
Turn the ignition switch on (do not start the engine) and the gasoline pump will typically run for a few seconds to build up fuel pressure. At this point, you can hear the hum of the petrol pump. If you don't hear any sound, the fuel pump or circuit may be faulty.
3. Check fuel pressure
Fuel pressure is a key indicator of whether the gasoline pump is working properly. The following are fuel pressure reference values for common models:
| car model | Fuel pressure (Bar) |
|---|---|
| Ordinary naturally aspirated engine | 3.0-4.0 |
| turbocharged engine | 4.0-6.0 |
| diesel engine | 2.0-3.0 |
Measure the fuel pressure using a fuel pressure gauge connected to the test port on the fuel rail. If the pressure is lower than the standard value, the fuel pump may be faulty or the fuel filter may be clogged.
4. Check the gasoline pump circuit
If the gas pump isn't working, there may be an electrical problem. Use a multimeter to measure the supply voltage to the gasoline pump (usually 12V). If there is no voltage, check fuses, relays and associated wiring.
5. Check the gasoline pump resistance
Disconnect the power plug of the gasoline pump and measure its resistance. The resistance of a normal gasoline pump is usually between 1-5 ohms. If the resistance value is too high or infinite, the gasoline pump motor may be damaged.
3. Maintenance recommendations for gasoline pumps
In order to extend the service life of the gasoline pump, the following maintenance measures can be taken:
| Maintenance measures | Description |
|---|---|
| Replace fuel filter regularly | It is recommended to replace it every 20,000 kilometers |
| Keep the fuel tank full of fuel | Prevent gasoline pump damage due to overheating |
| Use high quality fuel | Reduce damage to gasoline pumps caused by impurities |
| Avoid driving with low oil level for long periods of time | Low oil level can cause poor heat dissipation from the gasoline pump |
4. Things to note when replacing the gasoline pump
If the inspection confirms that the gasoline pump is faulty and needs to be replaced, please pay attention to the following:
1. Make sure the vehicle is in a safe condition and disconnect the negative terminal of the battery before replacement.
2. Choose original products or quality-reliable alternatives.
3. When replacing, be sure to clean the inside of the tank to prevent impurities from entering the new pump.
4. After installation, check whether all seals are intact to avoid fuel leakage.
5. Summary
The inspection of the gasoline pump requires a combination of symptoms, pressure testing, and circuit testing. Through the methods introduced in this article, you can initially determine whether the gasoline pump is working properly. If the problem is complex or cannot be solved by yourself, it is recommended to contact professional maintenance personnel in time.
Regular maintenance of gasoline pumps and fuel systems can effectively avoid sudden failures and ensure normal vehicle operation.
check the details
check the details
en
