Where is the fuel rail schrader valve for 2004 impala?

The fuel rail Schrader valve on a 2004 Chevrolet Impala is located on the fuel rail itself, near the top of the engine. It's usually towards the passenger side (right side) of the engine, but you'll need to visually inspect the fuel rail to pinpoint its exact position. It will be a small, usually silver, valve with a cap on it. Because it's near the top of the engine, you may need to work around other components to access it.