Fuel Filter: Description and Operation

Fuel Filter View:

The fuel filter prevents impurities in the fuel from getting into the primary-pressure regulator, the fuel distributor, and the injection valves.
The fuel filter housing is made of metal. It is fitted into the fuel circuit after the fuel pump. The filter contains a paper insert with a medium pore size of 4 micrometers, backed up by a fluff strainer which retains any loose paper particles. A support plate holds the filter in place.
Service life depends on the amount of dirt in the fuel and. The directional arrow indicates proper installation.