GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 34730-1A Fuel Pressure Gauge.

Caution: Relieve the fuel system pressure before servicing fuel system components in order to reduce the risk of fire and personal injury.

After relieving the system pressure, a small amount of fuel may be released when servicing the fuel lines or connections. In order to reduce the chance of personal injury, cover the regulator and the fuel line fittings with a shop towel before disconnecting. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete.


    Object Number: 15093  Size: SH
  1. Remove the injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.
  2. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  3. Disconnect the negative battery terminal.
  4. Loosen the fuel filler cap in order to relieve tank vapor pressure.

  5. Object Number: 180378  Size: SH
  6. Connect a J 34730-1A fuel pressure gauge to the fuel pressure connection. Wrap a shop towel around the fuel pressure connection while connecting the fuel pressure gauge in order to avoid spillage.
  7. Install the bleed hose into an approved container and open the valve to bleed the fuel system pressure. The fuel connections are now safe for servicing.
  8. Drain any fuel remaining in the fuel pressure gauge into an approved container.
  9. Replace the injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.
  10. Reconnect the negative battery terminal.