GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 34730-1A Fuel Pressure Gauge

Caution: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby.


    Object Number: 211140  Size: SH

    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.

  1. Disconnect the negative battery terminal to avoid possible fuel discharge if an accidental attempt is made to start the engine.
  2. Loosen the fuel filler cap in order to relieve the tank vapor pressure.

  3. Object Number: 49594  Size: SH
  4. Remove the fuel injector sight shield.
  5. Remove the fuel pressure connection.
  6. Wrap a shop towel around the fuel pressure connection while connecting the fuel pressure gauge in order to avoid spillage.
  7. Connect the J 34730-1A fuel pressure gauge to the fuel pressure connection.
  8. Install the bleed hose into an approved container and open the valve in order to bleed the system. The fuel connections are now safe for servicing.
  9. Drain any fuel remaining in the fuel pressure gauge into an approved container.