2
TECHNICAL INFORMATION
EN 28
2.9.6
Electric fuel pump (optional)
When the electric fuel pump is installed in a diesel engine,
one must:
1.
Remove any filters installed on the inlet of th
e
el
ectric fuel pump;
2.
Insert a pre-filter between the tank and the electri
c
pump;
3.
The electric pump must be installed on the
application at a height from the minimum tank level
such as to generate a MAX. pressure drop equal t
o
a column of 500 mm of fuel;
4.
Insert a shut-off valve to prevent dry operation du
e
to the emptying of the intake manifold;
5.
The electric pump must guarantee a supply
pressure at the inlet positive in all conditions.
Tab 2.18
Arrival pipe from the tank
Flow pipe from pre-filter to electric pump
Flow pipe to the fuel filter
Fig 2.10
Guards for fuel injection circuit components
High-pressure injection circuit components are particularly
sensitive to impurities.
To prevent impurities, even microscopic ones, from
accessing the fuel input or output unions, you are required
to close these accesses by means of specific caps as soon
as the various tubes are disassembled and disconnected.
D
isassembly of any component of the injection circuit must
not occur in dusty environments.
C
ap guards must remain closed in their housing
(ST_40)
until the moment they are to be used.
P
ay special attention when using the caps and avoid any
contamination of dust or dirt of any kind.
E
ven after using the caps illustrated in this paragraph, all
components of the injection circuit must be placed with
care in environments that are free of any type of impurity.
F
ig. 2.11 and 2.12
illustrate the caps that must be used on
components of the injection circuit.
Fig 2.11
F
ig 2.12