There is no specified standard time for the replacement of the fuel pump, which is determined according to the usage. Generally, if there is no problem, the service life is 5 years or 100,000 kilometers. The function of the automobile fuel pump is to suck the gasoline out of the fuel tank and press it into the float chamber of the carburetor through the pipeline and the gasoline filter.

1. The maximum fuel supply of the general gasoline pump is 2.5-3.5 times larger than the maximum fuel consumption of the gasoline engine. When the oil consumption of the pump is greater than the oil consumption and the needle valve of the carburetor float chamber is closed, the pressure in the oil outlet pipeline of the oil pump increases, which reacts to the oil pump to shorten the diaphragm stroke or stop working;
2. The electric gasoline pump is not driven by the camshaft, but repeatedly sucks the pump membrane by electromagnetic force. This kind of electric pump can freely choose the installation position, and can prevent the phenomenon of air resistance;
3. When working, the flow of the gasoline pump should not only provide the consumption required by the engine operation, but also ensure that there is enough oil return flow to ensure the stable pressure of the fuel system and sufficient cooling.

The replacement cycle of the fuel pump assembly is as follows:
1. The failure rate of the automobile oil pump is higher than that of other electrical appliances. It is usually replaced after the fault is judged, and there is no certain replacement cycle;
2. Installed in the fuel tank, if the car runs with the fuel alarm indicator light on for a long time, the temperature of the gasoline pump will be too high;
3. It will affect its service life. It is recommended not to wait for the fuel indicator of the car to light up before refueling.
4. When the filter is disassembled, it is easy to cause damage to the oil pump, which creates the illusion that the oil pump is easily broken. It is recommended to go to regular manufacturers for maintenance to avoid unnecessary expenses caused by technical reasons.