Fuel Pressure Release
WARNING: This page is about a different car, the 2002 Mazda B3000 and 2001 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Fuel system is under pressure. Pressure must be released before servicing fuel system components.
Remove fuel tank cap to release fuel tank pressure. Using fuel pressure gauge, release fuel pressure from pressure relief valve on fuel rail.