Where is schrader fuel valve on 2003 mercury grand marquis?

The Schrader valve on a 2003 Mercury Grand Marquis is located on the fuel rail, which is situated on the engine near the intake manifold. It typically resembles a tire valve and can be found on the side of the fuel rail that faces the passenger side. To access it, you may need to remove some components for better visibility, but it should be readily accessible when looking at the engine from the front.