Where is the fuel regulator on a 1999 express van?

On a 1999 Chevrolet Express van, the fuel pressure regulator is typically located on the fuel rail, which is situated on the engine. It's often identifiable as a small cylindrical component with a vacuum line connected to it. For some models, it may be necessary to remove the engine cover or other components to access it easily. Always consult the vehicle's service manual for specific details and safety precautions when working on fuel systems.