Where can you find vacuum line diagram for 1991 D250 cummins?

You can find the vacuum line diagram for a 1991 Dodge D250 with a Cummins engine in the vehicle's service manual or repair manual, which typically includes detailed diagrams and specifications. Additionally, online resources such as automotive forums, websites like DodgeForum.com, or dedicated Cummins enthusiast sites may have downloadable diagrams or user-contributed content. Checking with a local dealership or parts supplier may also yield the necessary information.