Fuel Pressure Sensor/Switch: Service and Repair

Fuel Pressure Sensor

Removing

The fuel pressure sensor (G247) measures the current fuel pressure in the high pressure system and delivers a voltage signal to the engine control module (J623).

CAUTION!
• Follow the guidelines for a clean working environment when working on the fuel system. Refer to => [ Safety Precautions ] Multiport Fuel Injection.

• Always follow these rules before and during work.

- Remove the intake manifold. Refer to => [ Intake Manifold ] Intake Manifold.

- Before removing, clean the threaded area around the fuel pressure sensor, using a commercially available detergent. Dirt must not enter the rail hole.

• Clean carefully, cleaner must not enter the connector.

- Dry the fuel pressure sensor.

- Disconnect the electrical connector from the fuel pressure sensor.

- The fuel pressure sensor must be removed with both high pressure lines.

- Remove the high pressure line union nuts on the left and right fuel rail.

- Remove the fuel pressure sensor bolt - 9 -.





- Loosen the bolts - 1, 2, 3, 4, 5, and 7 - on the fuel rail (cylinder bank 1) a few turns.





- Pull the fuel rail up slightly to disconnect the high pressure line from the fuel rail.

- Remove the fuel pressure sensor with the high pressure lines.

- Suction any dirt out of the rail hole (thread and sealing surface). Do not use mechanical tools.

• Do not change the angles of the high pressure lines.

• Seal the rail hole immediately with a suitable plug to prevent dirt from entering.

Installing

- Tighten the fuel pressure sensor with the high pressure lines connected.

For the fuel pressure sensor tightening specification, refer to => [ Component Location Overview ] Locations.

• The high pressure line connectors - arrows - must not be damaged.

• Do not bend the high pressure line to a different angle.

- Hand-tighten the union nuts for the high-pressure lines.

- Make sure the high-pressure lines are seated free of stress.

- Tighten bolts - 1, 2, 3, 4, 5 and 7 - in stages in a diagonal sequence.





• For the fuel rail tightening specification, refer to => [ Fuel Injectors and Fuel Rail Assembly Overview ] Fuel Injectors and Fuel Rail Assembly Overview

- To tighten SW 17 union nut for high pressure line, use the torque wrench (V.A.G 1331) with tool insert, AF 17 (V.A.G 1331/6).





• High Pressure Lines, Tightening Specifications => [ High Pressure Line Tightening
Method ] High Pressure Pump Assembly Overview

Further installation is in reverse order.

- Install intake manifold. Refer to => [ Intake Manifold ] Intake Manifold.





- Carefully check the entire fuel system for leaks.

If there are leaks despite correct tightening specifications, replace the affected component.