GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 34730-1A Fuel Pressure Gage
    • J 34730-262 Fuel Pressure Gage Fitting

Installation Procedure

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.

Caution: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete.

Notice: Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:

   • The fuel pipe connections
   • The hose connections
   • The areas surrounding the connections

    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.
  2. Remove the fuel pressure connection valve cap.
  3. Important: Install the fuel pressure gage fitting above the belt in order to avoid contact with the belt.

  4. Install the J 34730-262 to the fuel pressure connection.
  5. Connect the J 34730-1A to the fuel pressure connection. Wrap a shop towel around the fuel pressure connection while connecting the fuel pressure gage in order to avoid spillage.
  6. Install the bleed hose into an approved container and open the valve to bleed the system pressure. The fuel connections are now safe for servicing.
  7. Drain any fuel remaining in the fuel pressure gage into an approved container.
  8. Close the bleed valve on the fuel pressure gage.
  9. Command the fuel pump ON with a scan tool.
  10. Inspect for fuel leaks.

Removal Procedure

  1. Place the fuel pressure gage bleed hose into an approved container and open the bleed valve to bleed fuel system pressure.

  2. Object Number: 736294  Size: SH
  3. Place a shop towel under the fuel pressure gage adaptor fitting to catch any remaining fuel spillage.
  4. Remove the J 34730-1A from the adaptor fitting.
  5. Remove the J 34730-262 .
  6. Drain any fuel remaining in the fuel pressure gage into an approved container.
  7. Install the cap on the fuel pressure connection.