The symptom of a blocked diesel filter is that when the fuel valve is filled, the fuel supply is insufficient, causing the oil pressure to be too low. The diesel engine may experience insufficient power, weak driving, and black exhaust smoke.

The diesel filter element is one of the important components to ensure the quality of diesel engine oil intake. There are two main types of diesel filter elements, the rotary type and the replaceable type. The arrow on the diesel filter housing indicates the direction of fuel flow, and it is not allowed to install the diesel filter upside down. High quality diesel filters can effectively block the fine dust and moisture carried in diesel, and greatly extend the service life of fuel injection pumps, diesel nozzles, and other filtering components. Improper fuel selection can easily cause blockage of the diesel filter, causing unstable idle speed, poor acceleration, and increased fuel consumption in the engine. It can also accelerate cylinder wear, directly affecting the engine's lifespan. The diesel filter must be replaced every 30000 kilometers. If the fuel impurity content is high, the replacement time should be shortened accordingly. When it is found that the color of the filter element inside the diesel filter has noticeably turned black, it indicates that the filter element has been severely contaminated by harmful substances and needs to be replaced in a timely manner.