Fuel System Pressure Release: Montero
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Mitsubishi Outlander, 2003 Mitsubishi Montero Sport, 2003 Mitsubishi Montero, 2003 Mitsubishi Lancer, and 2003 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
Turn the ignition off. Fold down the second seat. Remove the service hole cover (upper) and packing. Remove the service hole cover (lower) and packing. Disconnect fuel pump module connector. See Fig 1. Start the engine and let it run until it stops naturally. Turn the ignition off. Connect the fuel pump module connector.