Fuel Pressure Measurement

Special Tools

• CH-42982  Fuel Pressure Gauge Adapter
• EN-34730-91  Pressure Tester

Equivalent regional tools: Special Tools

1. Fuel Feed Front Pipe (2) @ Fuel Pump (1)» Remove
   Fig 1: Fuel Feed Front Pipe

   Courtesy of GENERAL MOTORS COMPANY
   WARNING: Refer to Gasoline/Gasoline Vapors Warning .
   WARNING: Refer to Relieving Fuel Pressure Warning .
2. Install the CH-42982  gauge adapter (2) to the fuel pump (4) and fuel feed front pipe (3).
   Fig 2: Tester And Gauge Adapter

   Courtesy of GENERAL MOTORS COMPANY
3. Install the EN-34730-91  tester (1) to the CH-42982  gauge adapter.
4. Start the engine.
5. Bleed the pressure tester at idling speed.
6. Collect the exiting fuel in a suitable container.
7. Read the fuel pressure from the pressure gauge.

   Nominal value: 3.8 - 4.2 bar (380 - 420 kPa)

8. Stop the engine.
9. Release fuel pressure at fuel pressure tester.

   Collect escaping fuel in a suitable container.

10. Disconnect the EN-34730-91  tester from the CH-42982  gauge adapter.
    Fig 3: Tester And Gauge Adapter

    Courtesy of GENERAL MOTORS COMPANY
    CAUTION: Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution .
11. Remove the CH-42982  gauge adapter (2) from the fuel pump (4) and fuel feed front pipe (3).
12. Fuel Feed Front Pipe (2) @ Fuel Pump (1)» Install
    Fig 4: Fuel Feed Front Pipe

    Courtesy of GENERAL MOTORS COMPANY