The fuel filter is recommended to be replaced every 10,000 kilometers, and the built-in fuel filter in the fuel tank is replaced by 40,000-80,000 kilometers. There may be slight differences in the maintenance intervals between different models.

Fuel filter replacement steps:
1. First, loosen the clamping device at the junction of the oil circuit and the fuel filter, then remove the fuel filter from the oil circuit, and then plug the oil circuit with a plug to prevent fuel overflow;
2. Most fuel filters installed in the oil circuit are marked with two arrows, one is the fuel inflow arrow, and the other is the fuel outflow arrow. The arrows are used to indicate the flow direction of the fuel when it passes through the fuel filter. So when we install the fuel filter, we must make the direction of the arrow point to the engine, that is, the oil flows to the engine;
3. In addition, it should be noted that the clamping device used in the oil circuit is specially designed, and the two parts are clamped tightly at the junction of the rubber hose and the fuel filter to achieve a sealing effect. Compared with the ordinary clamping device, this clamping device will not cut into the rubber hose, so it will not cause damage to the rubber hose. At the same time, the clamping device can withstand high oil pressure. Finally, we should also ensure that the rubber hose clamping device is installed in the correct position and clamps the joint according to the specified specifications.