Where is orifice screen on 1999 peterbilt 379?

On a 1999 Peterbilt 379, the orifice screen is typically located within the fuel system, specifically in the fuel filter or fuel line assembly. It serves to filter out contaminants and prevent them from entering the fuel injectors. To access it, you may need to remove the fuel filter or the fuel line components, depending on the specific setup of your vehicle. Always consult the vehicle's service manual for detailed instructions.