What should the fuel pressure be on a 2000 mercury mystique?

The fuel pressure for a 2000 Mercury Mystique should typically be between 30 to 40 psi (pounds per square inch) at the fuel rail when the engine is running. It's important to check the specific requirements in the vehicle's service manual, as variations can occur based on the engine type and configuration. If the pressure is outside this range, it could indicate issues with the fuel pump, regulator, or other components of the fuel system.