1. Fuel filter − 2. Feed pipeline from f ilter to fuel pump − 3. Feed pipeline from priming pump to filter − 4. Priming pump
Description of working principles
Fuel is suc ked from the fuel tank by the priming pump. This last
one is placed on the engine basement and is driven by the cam-
shaft.
Throughout the filter/s, the fuel is piped to the union fitting va-
cuum chamber of the transfer pump . (For applications to be
equipped in cold climate areas, the fuel filter is provided with
heater).
Transfer pump is placed inside the feed pump, and is bladed ty-
pe; its duty is to increase fuel pressure in correspondence with
the increase of the number of revolutions.
Fuel is delivered to the pressure gauge valve within feed pump.
Timing plungers further increase the pressure and deliver fuel
to the injectors throughout the delivery pipe fittings.
Fuel bleeding from the injectors is recovered and piped back to
the pump.
76519
Figura 7
E NG I NE S
10
SE CT I O N 2− FEED ED. FEBUARY 2003
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