Fuel Delivery and Air Induction: Testing and Inspection

WM 200101 Checking fuel system (high-pressure side) for leaks - turbo engine

Tools






Information

Requirements

If only the high-pressure pump is removed and installed, the intake manifold must be removed for leak testing.
1. Battery disconnected.
-> 2X00IN02 Work instructions after disconnecting the battery .
2. Air cleaner housing removed.
-> 242519 Removing and installing air cleaner housing - turbo engine Service and Repair.
3. Intake-air distributor removed.
-> 244619 Removing and installing intake-air distributor - turbo engine Service and Repair.

Checking

Component overview

CAUTION

Dirt on injection system components (intake manifold injection and direct fuel injection system)

- Material damage
- Rough-running engine
- Bad exhaust emissions

-> Thoroughly clean connection points and adjacent areas before loosening them. If the engine is very dirty, wash it before starting disassembly work.
-> Lay removed parts on a clean surface and cover them. Only use a clean, lint-free cloth.
-> Carefully cover components or seal them if repair work will not be carried out immediately. Place rubber caps on connections. Seal intake openings with film or adhesive tape.
-> Only install clean parts. Do not take spare parts out of the packaging until just before installation.
-> Never use compressed air when the system is open. Do not move the vehicle.

Information

- Always perform a leak test in the high-pressure area after opening the fuel system.

- This is particularly important if components are disassembled and replaced.

- The threaded connections of the fuel lines must be coated with OKS 1700 lubricant (Part no. 000.043.207.36) before being screwed back on again.

- Blow residual fuel out of the lines and high-pressure pump (into a fuel-resistant container or cloth) using compressed air before installation.

- The tightening specifications must be strictly observed.

Overview of fuel system in engine compartment





Component overview of fuel system at engine






Subsequent work

1. Install intake-air distributor.
-> 244619 Removing and installing intake-air distributor - turbo engine Service and Repair.
2. Install air cleaner housing.
-> 242519 Removing and installing air cleaner housing - turbo engine Service and Repair.
3. Connect the battery.
-> 2X00IN02 Work instructions after disconnecting the battery .
4. Use the PIWIS Tester 9718 to bleed the high-pressure system using the First Start function.
-> 2001IN Bleeding fuel system high-pressure side (First Start function) 2001IN Bleeding fuel system on high-pressure side (First start function).
5. Perform a test drive. A high-pressure adaptation is only necessary if the high-pressure pump has been replaced.
-> 247019 Removing and installing DME (DFI) control unit Service and Repair.