Iveco VECTOR 8, Technical And Repair Manual

Page: 36 / 206

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.
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8
SECTION 2 - FUEL VECTOR 8 ENGINES
Base - April 2006 Print P2D32V001E