Fuel Filter: Description and Operation

FUEL FILTER/PRESSURE REGULATOR




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 and 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.
(1) Fuel Inlet
(2) Fuel Return
(3) Fuel Outlet