Diesel supply circuit

K9K

Functional diagram of the diesel supply circuit

The circuit consists of:

• a gauge (1),
• a priming bulb (2),
• a fuel filter (3) that may be fitted with a water detection sensor,
• a high-pressure pump (4) incorporating a mechanical lift pump (transfer pump),
• a flow actuator (5),
• a fuel rail (6) fitted with a fuel pressure sensor (7),
• four solenoid injectors (8) fitted with relief valves,
• a venturi (9),
• various sensors,
• an injection control unit.

Never loosen a high-pressure pipe connection while the engine is running.

It is forbidden to:

• disassemble the inside of the pump and the injectors.

  Only the flow actuator, the fuel temperature sensor and the venturi may be replaced,

• remove the fuel rail pressure sensor (to avoid contaminating the circuit).

  If the pressure sensor fails, the pressure sensor, the rail and all five high-pressure pipes must be replaced.

F9Q

Functional diagram of the diesel supply circuit

The circuit consists of:

• a priming bulb (1) (located in the engine compartment),
• a fuel filter (2) that may be fitted with a water detection sensor,
• a high-pressure regulator (3) mounted on the pump,
• a high-pressure pump (4),
• a fuel rail (5) fitted with a fuel pressure sensor and a pressure limiter (6),
• four solenoid injectors (7),
• various sensors,
• an injection control unit.

Never loosen a high-pressure pipe connection while the engine is running.

It is forbidden to disassemble the inside of a high-pressure pump and the injectors.