High Pressure Pump
Fuel system is under high pressure! Before opening the system, perform the procedure for releasing fuel pressure. Refer to BEFORE OPENING HIGH PRESSURE FUEL INJECTION SYSTEM
For safety reasons, if the battery is not disconnected, fuse -SF 6- from the Fuel Pump (FP) Control Module -J538- must be removed before opening fuel system. Otherwise, the fuel pump will be activated by the driver's door contact switch.
The fuse is located in the fuse holder in the right of the luggage compartment.
By removing fuse -SF 6-, the voltage supply to terminal 30 for the Fuel Pump (FP) Control Module -J538- is interrupted.
The removal and installation of the high-pressure fuel pump can only be performed on a cold engine.
When installing the high-pressure fuel pump, make sure that no dirt enters the fuel system.
Catch escaping fuel with a rag.
The O-ring must always be replaced.
The fuel return line banjo fitting must always be replaced.
High-pressure fuel lines must always be fastened free of tension.
Removing
-- Remove engine cover.
-- Disconnect electrical connectors from Low Fuel Pressure Sensor -G410- -1- and Fuel Pressure Regulator Valve -N276- -2-.
-- Open both fuel lines -2 and 3-.
-- Remove 3 bolts -arrows-.
-- Carefully pull out the high-pressure fuel pump. The sleeve may remain inserted in the cylinder head.
Installing
-- Replace O-ring for the high-pressure pump.
-- Carefully place high pressure pump with sleeve in opening in cylinder head (check sleeve for damage first).
-- Tighten bolts by hand.
-- Before installing the fuel lines, check the torque of the connections on the high-pressure pump.
- Fuel return line connections tightening specifications. Refer to HIGH PRESSURE PUMP ASSEMBLY OVERVIEW .
- Fuel supply line connections tightening specifications. Refer to HIGH PRESSURE PUMP ASSEMBLY OVERVIEW .
-- Always tighten bolts alternating sides with the required torque.
- High Pressure Pump Tightening Specification. Refer to HIGH PRESSURE PUMP ASSEMBLY OVERVIEW .
-- Firmly place fuel return line hose (with hose clamp) on connection. Align so it is free of stress.
-- Tighten fuel supply line union nut by hand. Align so it is free of stress.
- Fuel supply line (union nut) tightening specifications. Refer to HIGH PRESSURE PUMP ASSEMBLY OVERVIEW
-- Connect electrical connectors on Low Fuel Pressure Sensor -G410- and for Fuel Pressure Regulator Valve -N276-.
-- Re-insert fuse if it was removed.
Check fuel system for leaks.