It is the cartridge type with a filter element
(1) made up of a pack of paper discs with a filtering surface area
of 5300 cm2 and a filtration degree of 4 - 5 μμ.The filter has a fuel pre-heating device
(2) controlled by a thermal switch (3) fitted on the actual filter.
When the temperature of the diesel is below 6°C an electrical resistor
heats it up to a maximum of 15°C before sending it to the injection
pump.There is a plug (4), in the base of the
fuel filter cartridge, for draining the water from the filter.
LOW PRESSURE REGULATING VALVE
The valve is located on the fuel filter
and consists of a ball loaded by a calibrated spring.When the fuel supply pressure acting on
the ball overcomes the load of the counter spring, some of the fuel
is recirculated to the tank through the return pipe.