Passat Sedan V6-3.6L (BLV) (2008)
Fuel Pressure Release: Service and Repair
Releasing Pressure In High Pressure Area
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.
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
To conclude work, check DTC memory of Engine Control Module (ECM), erase all DTC entries which may have occurred from removing the
NOTE: If DTC memory was erased, generate readiness code "Guided Function".