Engine Iveco Vector 8. Manual — part 5

Figure 2

The fuel system consists of a low pressure part and a high pressure part.

The low pressure pump (LPP) (no.7) is located on the left side of the engine and it sucks the fuel from the fuel tank.

The fuel drawn in by the low pressure pump enters the pre-filter (5) where the water and the larger particles of impurities, that
may be present, are separated out.
This filter is equipped with a heater element (on certain applications) used to increase the temperature of the fuel in low
temperature conditions. There is also a mechanical pump on the pre-filter that is used to prime the circuit. On reaching the low
pressure pump, the fuel is sent for filtering to the filter or filters depending on the applications (8). The pump pressure is maintained
at 5 bar.

The high pressure system is a common rail system consisting of a high pressure pump and 8 injectors, which is electrically
controlled by an ECM.

1. Electro—injector — 2. Common rail — 3. Pressure sensor — 4. Common rail pressure relief valve —

5. Fuel pre-filter — 6. High—pressure pump — 7. Low—pressure pump — 8. Fuel filter.

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SECTION 2 - FUEL

5

VECTOR 8 ENGINES

Print P2D32V001E

Base - April 2006

OPERATION

Figure 3

The fuel system is composed of a low—pressure circuit and a high—pressure circuit.

The high—pressure circuit is composed of the following pipes:

- pipe connecting the high—pressure pump outlet to the common rail;

- pipes connecting the electro—injectors to the common rail.

The low—pressure circuit is composed of the following pipes:

- fuel suction pipe from the tank to the pre—filter equipped with a priming pump, fuel pre—heating element and clogging sensor;

- pipes supplying the mechanical low—pressure fuel pump;

- pipe from the low pressure pump to the fuel filter/filters;

- pipes which supply the high pressure pump from the filter/filters;

The fuel system is completed by the fuel return circuit from the common rail, injectors and high—pressure pump.

103270

DIAGRAM SHOWING PIPES FOR G-DRIVE / SPRINKLER APPLICATIONS

6

SECTION 2 - FUEL

VECTOR 8 ENGINES

Base - April 2006

Print P2D32V001E

Figure 4

103513

DIAGRAM SHOWING PIPES FOR DRAGON / GRIFFON APPLICATIONS

SECTION 2 - FUEL

7

VECTOR 8 ENGINES

Print P2D32V001E

Base - April 2006

Rif.

Description

1

Injector

2

Common rail pressure relief valve

3

Pressure sensor

4

Common rail

5

Diesel pre-filter

6

High pressure pump

7

Low pressure pump

8

Fuel filters (depending on the application)

Figure 5

Fuel system diagram

1. High—pressure pump — 2. Rail pressure valve — 3. Pressure sensor — 4. Common rail — 5. Clogging sensor on fine fuel

filters — 6. Fuel filter/s (*) — 7. Low—pressure pump — 8. Pre—filter with pre—heating element and priming pump —

9. Fuel tank.

*

The number of fuel filters depends on the application.

The fuel drawn from the tank (9) is sent to the pre—filter (8) and from here to the low—pressure pump (7).

From the pump (7), the fuel reaches the fuel filter/s (6) and from there it goes to the high pressure pump (1).

The pressure relief valve fitted on the high—pressure pumps inlet side, keeps the inlet pressure at a constant level of 5 bar, so
the M—Promp (high—pressure regulator) receives a constant flow of fuel in order to work properly.

The M—Promp valve located upstream from the high—pressure pump, governs the necessary flow to the high pressure pump
allowing only the fuel necessary to maintain the pressure in the rail, improving energy efficiency and limiting system heating.

The high—pressure pump (1) takes the fuel up to a pressure of 1600 bar, depending on the engine conditions.

From the high—pressure pump the fuel is directed through the rails (4) to the electro—injectors.

The excess flow from the injectors and from the over pressure valve is collected and sent through pipes to the fuel tank.

The high—pressure pump drainage (excess fuel) is re—circulated by a pipe going directly to the low—pressure pump.

103269

8

SECTION 2 - FUEL

VECTOR 8 ENGINES

Base - April 2006

Print P2D32V001E