Types and Functions of Fuel Filters
When diesel generators are operating normally, the diesel they use must undergo a certain period of settling, and strict filtration is required during normal use. This is mainly because diesel contains impurities such as dust, residues, and colloids. In order to remove impurities and dust from diesel, fuel filters are installed in the fuel supply system of diesel generators.
Fuel filters generally come in two types: coarse filters and fine filters. The filters installed at the fuel tank inlet and the inlet of the fuel transfer pump belong to coarse filtration, while the fine filter is installed between the fuel transfer pump and the fuel injection pump. Fine filters are usually divided into two types: felt and paper. The advantage of paper filters is their high mechanical strength and stiffness, low price, and certain water resistance, with a minimum filtration fineness of up to 0.005mm. Therefore, they are widely used in various types of diesel generators. However, these filters cannot be cleaned and are typically replaced with new ones after about 300 hours of use.
The function of the fine filter is to remove metal particles and solid impurities from diesel, ensuring that clean diesel is delivered to the fuel injection pump. It mainly consists of a filter, housing, and filter base. The quality of the fuel filter directly affects the normal operation of the fuel supply system of diesel generators. Only by using and maintaining it correctly can the fuel filter remain in good condition. Typically, the fine filter element and housing should be removed and cleaned or replaced in diesel or kerosene every 200 to 250 hours of operation. At the same time, water and sediment should be drained, and the inlet filter screen of the fuel transfer pump should be cleaned irregularly. If the impurities in the fuel filter element are not cleaned in time, impurities in the diesel may enter the injection pump, causing damage such as scratches or seizure of the plunger components.
