The function of the fuel pump is to suck the fuel from the fuel tank, pressurize it and deliver it to the fuel supply pipe, and cooperate with the fuel pressure regulator to establish a certain fuel pressure.
But what will happen to the car if the fuel pump fails?
Let's take stock of the fuel pump failure phenomena and solutions
Inaccurate oil level-fault description and analysis
- The oil level is inaccurate after the oil pump is installed and the oil gauge never moves
- Check whether the installation is correct and whether there are wiring harnesses or other things blocking the oil level rocker arm and float rod assembly during the installation process.
- Check whether the plug has poor oxidation contact. This situation is caused by the oil pump not being powered on. Inaccurate oil level.
- The oil pump is installed in the wrong direction, and the oil pump float rod assembly is blocked by foreign objects such as the wave plate or the tank wall, resulting in inaccurate oil level. (There are usually corresponding arrows on the flange of the oil pump assembly and the tank port)
- The wave plate falls off and blocks the float rod assembly, resulting in inaccurate oil level
- The oil level line terminal falls off, and the oil level or wiring harness is broken, resulting in inaccurate oil level.
- The oil level is inaccurate when the oil pump is just installed, but the oil gauge pointer will swing
- Check whether the installed oil pump assembly matches the vehicle model? If the two are not compatible, the oil level is bound to be inaccurate. By the way, check whether there are two oil levels.
- The oil level is inaccurate due to reverse installation. For example, the oil level of the old Mazda 6 can be installed upside down, but the oil level will be inaccurate after inverted installation.
- The oil level is inaccurate due to line cross-current. The normal oil level voltage is between 3.5 and 5 volts. If it exceeds this voltage, the oil level is inaccurate. If the oil level voltage reaches 12 volts due to a fault between the lines, the oil level will burn.
- The oil pump itself needs to be returned to the factory for repair.
- The oil level is inaccurate due to incorrect assembly of the diffraction tube. For example; New Pa.
- The oil pump is inaccurate after being installed for a period of time
In this case, it is also necessary to check whether the anti-wave plate in the fuel tank has fallen off and displaced to block the oil level, and whether the line is cross-current to cause the oil level to be inaccurate.
- The oil level is inaccurate when the vehicle has a main and auxiliary pump
(ECU displays the oil level by collecting the total oil volume of the two oil levels on the main and auxiliary pumps)
- The auxiliary pump plug is not properly plugged in, resulting in inaccurate oil level.
- The auxiliary pump oil level is damaged, resulting in an error in the average value collected by the ECU, resulting in inaccurate oil level.
- The diffraction tube connecting the main and auxiliary fuel tanks is missing or blocked, so that the fuel in the auxiliary tank cannot be normally transmitted to the main tank. When the main tank fuel is exhausted and the vehicle is turned off, the fuel gauge still shows that there is oil. This situation is not a fuel pump problem, but the owner who does not understand the reason will mistakenly think it is a fuel pump problem. At this time, the reason needs to be explained to the owner, and the fuel pump can be exempted from after-sales service.
Pressure relief-fault description and analysis
- Car secondary ignition or multiple ignition
Fuel supply system leaks oil, resulting in no pressure maintenance after parking and shutting down. Possible leaks include the oil rail, fuel injector, gasoline filter, or the oil pump pressure valve and fuel pump core check valve.
PS: It is normal if the car can be successfully ignited once within 72 hours after parking and shutting down, or if it cannot be successfully ignited once after more than 72 hours.
- Car acceleration is weak
- The oil pump is replaced, and the air in the oil pump is not exhausted. (Air can be restored to normal after exhaustion).
- If multiple oil pumps are replaced, the acceleration is weak. Check whether there is a problem with the air flow meter. If there is a problem with the air flow, the accurate intake volume cannot be calculated, and the CPU cannot give an accurate oil output, resulting in the failure of the fuel in the engine to reach the ideal combustion state.
- It may be the gasoline filter or the fuel pump filter, resulting in insufficient oil supply from the oil pump. Cleaning the fuel tank and replacing the gasoline filter or the fuel pump can solve the problem.
- The fuel supply system leaks oil and causes the pressure to not be maintained. The possible leaks are the oil rail, fuel injector, gasoline filter, or the oil pump pressure valve, and the fuel pump core check valve.
- The car automatically shuts down
- Check whether the ignition system (ignition coil, spark plug, fuel injector) is abnormal.
- The fuel supply system leaks oil and causes the pressure to not be maintained. The possible leaks are the oil rail, fuel injector, gasoline filter, or the oil pump pressure valve, and the fuel pump core check valve.
- It may be that the gasoline filter or the fuel pump filter is blocked, resulting in insufficient fuel supply from the fuel pump. Cleaning the fuel tank and replacing the gasoline filter or fuel pump can solve the problem.
- If multiple fuel pumps are replaced, the acceleration is weak. Check whether there is a problem with the air flow meter. If there is a problem with the air flow, the accurate intake volume cannot be calculated, and the CPU cannot give an accurate oil output, resulting in the failure of the fuel in the engine to reach the ideal combustion state.
All pressure relief situations can be checked from the three aspects of the fuel supply system, the ignition system, and the air flow
