Case 445/M2, Service Manual

Page: 26 / 178

1. Fuel filter − 2. Feed pipeline from filter to fuel pump − 3. Feed pipeline from priming pump to filter − 4. Priming pump
Description of working principles
Fuel is sucked 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.
The fuel arrives therefore to the valve gauging the pressure insi-
de feed pump.
The distribution plunger further increases this pressure and de-
livers fuel throughout the delivery pipe fitting to the injectors.
The fuel drawing from the injectors is recovered and delivered
to the tank again.
75807
2
1
3
4
Figura 2
E NG I NE S
4
SE CT I O N 2 − FEED
ED. FEBUARY 2003