Fuel Pressure Regulator
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
The fuel pressure regulator, also referred to as the pulse damper, is mounted to the fuel pump bracket within the fuel tank. It regulates fuel pressure supplied to fuel injectors. See Fig 1