Removal & Installation
1.8L, 2.0L, 2.8L (V6 & Vr6)
- Remove the negative battery cable.
- Remove the vacuum hose from the regulator.
- Remove the retaining clip from the fuel pressure regulator.
- Cover the fuel pressure regulator with a shop towel and remove it from the fuel rail.
- Installation is the reverse of removal.
The fuel pressure regulator controls the fuel pressure in relation to the intake manifold pressure.
- Obtain the following special tools and equipment. Equivalent tools may be substituted for OEM tools listed:
- Verify that the fuel pump is operational and delivery rate is OK.
Pressure tester VAG1318Adapter 1318/7Adapter 1318/10Connector 1318/13
The pressure tester must be installed with the shut off valve between the fuel supply line and the gauge for proper evaluation of residual pressure tests.
- Disconnect the fuel supply hose from the fuel rail.
- Connect the pressure tester, using required adapters.
- Open the shut-off valve on the pressure tester.
- Start the engine and allow it to idle.
- Measure the fuel pressure: it should be 51 psi (3.5 bar)
- If the proper specification is attained, disconnect the vacuum hose from the fuel pressure regulator. The fuel pressure should increase to 58.8 psi (4.0 bar).
- Switch the ignition to OFF.
- Check for leaks and residual pressure by observing the pressure drop on gauge.
After 10 minutes, the must be a residual pressure of at least 29.4 psi (2.0 bar).
- If residual pressure drops below 29.4 psi (2.0 bar), start the engine and let it idle.
- Turn the ignition switch to OFF after pressure has built up.
- Close the shut off valve on the pressure tester.
- Observe the pressure drop.
- If the pressure does not drop, check the check valve in the fuel pump.
- If the pressure drops again, open the shut-off valve on the pressure tester.
- Start the engine and run at idle.
- Turn the ignition switch to OFF after pressure build-up.
- At the same time pinch off the fuel return hose from the regulator to the fuel tank.
- If the pressure does not drop, replace the pressure regulator.
- If the pressure drops again, check pipe connections, O-rings on fuel rail and fuel injectors for leaks.