Fuel Pressure Measurement

Special Tools

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

Equivalent regional tools:Special Tools (Diagnostic Tools)Special Tools (Mechanical Tools)

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 .

1. Remove Fuel Feed Front Pipe (2) @Fuel Pump (1)
Fig 2: Tester And Gauge Adapter
Courtesy of GENERAL MOTORS COMPANY
2. Install the CH-42982  gauge adapter (2) to the fuel pump (4) and fuel feed front pipe (3).
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.

Fig 3: Tester And Gauge Adapter
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution .

10. Disconnect the EN-34730-91  tester from the CH-42982  gauge adapter.
11. Remove the CH-42982  gauge adapter (2) from the fuel pump (4) and fuel feed front pipe (3).
Fig 4: Fuel Feed Front Pipe
Courtesy of GENERAL MOTORS COMPANY
12. Fuel Feed Front Pipe (2) @Fuel Pump (1)