Fuel Pressure
- Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Ensure negative battery cable is disconnected. 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. Reconnect PCV valve hose and IAT sensor connector. Install air cleaner assembly. Start engine and idle at normal operating temperature. Check fuel pressure. See FUEL PUMP PERFORMANCE table. If fuel pressure is not as specified, see CIRCUIT TEST DIRECTORY table under CIRCUIT TESTS. If fuel pressure is as specified, release fuel pressure. Remove fuel pressure gauge and reinstall components removed. Start engine and check for leaks.
Courtesy of GENERAL MOTORS CORP. FUEL PUMP PERFORMANCE
| KOEO psi (kg/cm2
) |
Engine @ Idle psi (kg/cm2
) |
Hold Pressure psi (kg/cm2
) |
| 23-31 (1.6-2.2) |
13-20 (0.9-1.4) |
13 (0.9) |