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volkswagen Workshop Repair Guides


Passat Sedan V6-3.6L (BLV) (2008)

Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Fuel Pressure Release > System Information > Service and Repair

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Fuel Pressure Release: Service and Repair

Releasing Pressure In High Pressure Area

CAUTION:

-

The fuel injection system is divided into a high pressure section (maximum approximately 120 bar) and a low pressure system
(approximately 6 bar).

-

Before opening high pressure side - e.g. removing high pressure pump, fuel rail, fuel injectors, fuel pipes or fuel pressure sensor G247 - 
fuel pressure in high pressure area must be reduced to a residual pressure of approximately 6 bar. The procedure for this is as follows.

-

Pull coolant hose secure on intake manifold to side and unclip wiring harness below from its retaining clip.

-

Remove connector from fuel pressure regulator valve N276 on high pressure pump - arrow -.

-

Allow engine to idle approximately 10 seconds.

NOTE:
-

When the fuel pressure regulator valve N276 electrical connector is disconnected during idle, pressure in high pressure area decreases to
approximately 6 bar.

-

After high pressure has been released, high pressure system must be opened immediately. Otherwise, the pressure increases again due to the
warming of the fuel.

-

Switch off ignition.

CAUTION:  Fuel lines are pressurized. Wear protective goggles and protective clothing to prevent injuries and contact with skin. Before
opening the high pressure system, place a cloth around the connection.

-

Place a clean cloth around the connection point and carefully open to release the residual pressure of approximately 6 bar. Escaping fuel must be
absorbed.

-

To conclude work, check DTC memory of Engine Control Module (ECM), erase all DTC entries which may have occurred from removing the
connector.

NOTE:  If DTC memory was erased, generate readiness code "Guided Function".

Engine, Cooling and Exhaust > Engine > Cylinder Head Assembly > Fuel Pressure Release > System Information > Service and Repair

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