Daewoo MUSSO Service Manual page 703

1F2-52 M161 ENGINE CONTROLS
Fuel Pressure Test
1. Turn the ignition switch to "OFF" position.
2. Remove the fuel pressure test connector.
3. Connect the fuel pressure gauge to the fuel pressure test
connector.
4. Test the fuel pressure at idling by operating the engine.
Vacuum Hose Connected (bar)
Vacuum Hose Disconnected (bar)
5. Replace the pressure regulator diaphragm if out of the
specification.
3.2-3.6
3.7-4.2