Without Fuel Pressure Gauge (Tribute 2.0L)
WARNING: This page is about a different car, the 2003 Mazda Tribute, 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
To release fuel pressure, disconnect fuel pump relay. Fuel pump relay is located in underhood fuse/relay box. Remove fuel cap to release fuel tank pressure. Start engine allow to stall, crank engine over 2 more times to release system pressure.