Fuel Pressure

Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Disconnect PCV hose and Intake Air Temperature (IAT) sensor connector. Remove air cleaner assembly. Remove fuel inlet hose from throttle body. Install Fuel Pressure Gauge (J-34730-1) and Adapter (J-34730-75). See Fig 1 .
Reconnect negative battery cable. Start engine and idle at normal operating temperature. Check fuel pressure. See FUEL PUMP PERFORMANCE table. If fuel pressure is not as specified, go to appropriate ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK chart. If fuel pressure is as specified, release fuel pressure. Remove fuel pressure gauge and reinstall components removed. Start engine and check for leaks.

Fig 1: Installing Fuel Pressure Gauge (Metro)

Courtesy of GENERAL MOTORS CORP.

FUEL PUMP PERFORMANCE

KOEO ⁽¹⁾ psi (kg/cm² )

Engine @ Idle psi (kg/cm² )

⁽²⁾ Hold Pressure psi (kg/cm² )

23-31 (1.6-2.2)

13-20 (.9-1.4)

13 (.9)

⁽¹⁾	KOEO is ignition on and engine off.

⁽²⁾	Measured within one minute of engine off and with ignition on.