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 fu el 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, gov erns 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 sy stem heating.
The high—pressure pump (1) takes the fuel up to a pressure of 1600 bar, depending on the engine conditio ns.
From the high—pressure pump the fuel is directed through the rails (4) to the electro—injec t ors.
The excess flow from the injectors and from the over pressure valve is co llec t ed an d sen t th rou gh 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
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