B2300, B3000, B4000 & Tribute 3.0L
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Mazda Tribute, 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Install Fuel Pressure Gauge (49-UN01-010) on Schrader valve located on fuel rail. See Fig 1. Place fuel pressure gauge drain hose in suitable container and release fuel pressure slowly.