Fuel Pressure Regulator and Residual Pressure Checking, Engine Code BPS

Fuel Pressure Regulator and Residual Pressure Checking, Engine Code BPS

• Observe safety precautions. Refer to => [ Safety Precautions ] Multiport Fuel Injection.

• Observe the rules for cleanliness. Refer to => [ Clean Working Conditions ] Multiport Fuel Injection.

Special tools, testers and auxiliary items required

• Fuel inj. pressure gauge-cis (VAG 1318)

• Valve adapter (VAG 1318/9)

• Adapter (VAG 1318/17)

• Fuel line feed adapter (VAG 1318/23)

• Remote control (VAG 1348/3A)

• The fuel pressure regulator regulates the fuel pressure to approximately 4 bar.

• The fuel pressure regulator is located on the fuel filter. From May 2006, the fuel pressure regulator is integrated in the fuel filter and cannot be replaced.

• Observe the safety precautions. Refer to => [ Safety Precautions ] Multiport Fuel Injection.

• Observe the rules for cleanliness. Refer to => [ Clean Working Conditions ] Multiport Fuel Injection.

- Disconnect the 4 pin harness connector - arrow - from the fuel delivery unit.





CAUTION!
Fuel system is under pressure!

• Wear protective goggles and protective clothing to prevent injuries and contact with skin.

• Before loosening the line connection, place a cloth around the connection point. Then release pressure by carefully loosening the line connection.

- Disconnect the fuel supply line - 1 - from the filter and catch any leaking fuel with a cloth.





• Press in the securing ring to disengage the fuel line.

- Connect the (VAG 1318) with (VAG 1318/9) and (VAG 1318/17) to the fuel filter - 1 - and to the supply line - 2 -.





- Open the shut off lever on the (VAG 1318). The lever points in the direction of flow.

- Bleed the fuel supply system. Refer to => [ Fuel System, Bleeding ] Description and Operation.

- Reconnect the 4 pin harness connector to the fuel delivery unit.

- Start the engine and run at idle speed.

- Measure the fuel pressure.

• Specified value: approximately 4.0 bar

If the specification is not obtained

- Switch off ignition.

- Check the delivery quantity of the fuel pump. Refer to => [ Delivery Quantity, Checking ] Fuel Pump Checking, Engine Code BPS (Plastic Fuel Tank).

- If the fuel pump is OK, replace the fuel pressure regulator - item 5 - in => [ Fuel Pressure Regulator ] Removal and Replacement.

• From May 2006, the fuel pressure regulator is integrated in the fuel filter and cannot be replaced.

If specified value is achieved:

- Switch off ignition.

- Now check for leaks and residual pressure (entire system). Observe pressure drop on the (VAG 1318).

• After 10 minutes there must be a residual pressure of at least 3.0 bar.

If the holding pressure drops below 3 bar:

- Start the engine and run at idle speed.

- Wait until the pressure has built up, then switch off the ignition. Shut off lever on the (VAG 1318) must be closed at the same time (lever perpendicular to direction of flow - arrow -).





- Observe the pressure drop (engine side) on the (VAG 1318).

If the pressure drops again:

- Check line connections, O-rings at fuel rail and injectors for leaks. Refer to => [ Fuel Injectors, Checking Injection Quantity and for Leaks ] Fuel Injectors, Checking Injection Quantity and For Leaks.

- Check the (VAG 1318) for leaks.

• Before removing the (VAG 1318) , place clean cloths around the line connection which is to be disconnected.

If the pressure does not drop:

- Check line connections to the fuel tank and check valve in the fuel pump. Refer to => [ Fuel Pump Check Valve, Checking ] Fuel Pump Checking, Engine Code BPS (Plastic Fuel Tank).

- If the check valve is OK, replace the fuel pressure regulator - item 5 - in => [ Fuel Pressure Regulator ] Removal and Replacement.

• From May 2006, the fuel pressure regulator is integrated in the fuel filter and cannot be replaced.

- Bleed the fuel supply system. Refer to => [ Fuel System, Bleeding ] Description and Operation.