Generally, the fuel filter assembly has a number of parts. The filter is usually a cartridge with filter paper inside. It also has a strainer that captures foreign particles and water. The filter housing is normally made of metal.

The water sensor is an important part of a number of fuel filter assemblies. It is designed to alert the operator when the filter needs to be drained.

Another important component of the fuel filter assembly is the drain valve. It allows water to be drained from the system, so that only diesel remains. If the filter becomes clogged, it can cause trouble starting the vehicle.

Another component of the fuel filter is the filter support tube. It serves as a structural component and prevents filter media from falling in. It also acts as an outlet for the filtered fuel.

The fuel filter assembly with water separator is designed for small articulated loaders and excavators. It traps particles at one micron. The clear acrylic bowl makes it easy to see when the 120 mesh screen needs to be cleaned.
The filter element may be made of synthetic material or a natural material. The wide diaphragm prevents starving or overloading the filter.

A fuel filter can be located on the engine frame or the tank outside. It may also be part of an integrated fuel pump assembly. Most technicians include fuel filter replacement as part of a regular maintenance schedule.
Fuel filters help to improve fuel efficiency and performance. They also help to prevent the flow of dust and dirt into the engine. They may also have a water sensor that alerts the driver when water has entered the fuel system.