Fuel System

Fuel System

--> [ Fuel Pump, Checking ] Fuel Pump, Checking

--> [ Fuel Pressure Regulator Valve, Checking ] Fuel Pressure Regulator Valve, Checking

--> [ Intake Manifold Runner Control Valve, Checking ] Intake Manifold Runner Control Valve, Checking

--> [ Positive Crankcase Ventilation Heating Element, Checking ]
Positive Crankcase Ventilation Heating Element, Checking

--> [ Intake System, Checking for Leaks ] Intake System, Checking For Leaks

--> [ Fuel Pressure Sensor, Checking ] Fuel Pressure Sensor, Checking

--> [ Low Fuel Pressure Sensor, Checking ] Low Fuel Pressure Sensor, Checking

Observe Safety Precautions:

Observe Clean Working Conditions:

Check the Technical Bulletins for information that may supersede any information included in this service information.

• All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase.

• Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool.

• The manufacturers test box is available for purchase or rental.

CAUTION!
The use of nails, paper clips, or another unauthorized materials to back-probe electrical harness connectors is strictly prohibited and may cause damage to the electrical harness connectors, terminal ends or damage to a component. Use only the manufacturers test lead kit or an equivalent aftermarket test lead kit for back-probing all electrical harness connectors.

Safety Precautions

CAUTION!
• Fuel system is under pressure! Before opening system, place rags around the connection area. Then release pressure by carefully loosening the connection.

• Vehicles with FSI engine: The engine section of the fuel system, after the high pressure pump, is under extremely high pressure! When working on engine or fuel injection system, pressure must be relieved to residual pressure before opening high pressure components.

Perform the following steps before beginning work on the fuel supply system:

• Disconnect the battery Ground (GND) cable with the ignition switched off.

• Open the fuel filler flap briefly and then close again.

When removing and installing components from full or partially full fuel tanks, observe the following:

• The fuel tank must only be partially full. How much fuel can remain in the fuel tank may be read in the respective work description. Empty the fuel tank if necessary.

• Before starting work, switch on the exhaust extraction system and place an extraction hose close to the installation opening of the fuel tank to extract escaping fuel fumes. If no exhaust extraction system is available, a radial fan (as long as motor is not in air flow) with a displacement greater than 15 m3/h can be used.

• Prevent fuel from contacting the skin! Wear fuel-resistant gloves!

Clean Working Conditions

When working on the fuel supply/injection system, pay careful attention to the following rules of cleanliness:

• Thoroughly clean all connections and the surrounding area before disconnecting.

• Place parts that have been removed on a clean surface and cover them. Do not use fluffy cloths!

• Carefully cover over opened components or seal, if repairs are not performed immediately.

• Only install clean components: Only unpack replacement parts immediately prior to installation. Do not use parts that have been stored unpacked (e.g. in tool boxes etc.).

• When the system is open: Do not work with compressed air. Do not move vehicle unless absolutely necessary.