Turn the ignition OFF and disconnect the negative battery cable. Remove the engine appearance cover and locate the fuel pressure test port. Remove the fuel pressure test port cap. Wrap a shop towel around the test port and use a flat bladed tool or fuel pressure gauge to depress the port valve, relieving any system pressure. Install the port cap. When vehicle service is complete, turn the ignition ON to pressurize the fuel system. Start the vehicle and check the system for leaks.