Introduction - FUEL CIRCUIT PUMP/AND DEVICES

FUEL FILTER

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 grade of 4 - 5 μm.

The filter has a fuel pre-heating device (2) controlled by the engine management unit via a relay.

The control unit determines whether or not to activate the diesel filter according to a diesel temperature signal sent from sensor (3) fitted on the 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 through duct (5), with water presence sensor in the diesel filter.

The injection system diesel temperature sensor is fitted on the fuel filter with the fuel preheating device.

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.