Fuel Filter: Description and Operation

DESCRIPTION
The fuel filter/pressure regulator performs the function of controlling the fuel pressure delivered to the fuel rail and injectors and filtering all the fuel that the engine consumes.

Fuel pressure is controlled by a pressure balance across the regulator. The fuel system pressure is constant, it is no longer a function of engine load or a vacuum signal. This allows the system to be virtually "returnless," with fuel returning only from the filter/regulator at the engine compartment.

Only fuel delivered to the engine is filtered by the element in the filter/regulator. The return fuel is filtered by the mesh filter on the pump module.

Components
See Image.

1. Fuel Inlet
2. Fuel Return
3. Fuel Outlet