The vacuum diagram is on a sticker located on the hood underside or on the front radiator support cover
I have a pic I can send you of the diagram or you an find it in the chilton repair manual at auto zone
Either on the underside of the hood or in any Chilton or Hayes manual for your vehicle.
You can usually find vacuum diagrams for specific vehicles in the vehicle's service manual. Alternatively, you can search online for a diagram specific to the 1979 GM vapor canister vacuum system. Websites like autozone.com or manualslib.com may have the information you need.
Your local library has auto repair books that have wire and vacuum diagrams in them. They usually have them behind the counter. So you'll have to ask the staff for them.
Follow the link and buy the bookhttp://www.themotorbookstore.com/toyota-pickup.html
The Diagram Brothers was created in 1979.
If there is no decal under the hood and you can't find the routing diagram anywhere else, try your local public library's reference section for a manual on your vehicle.
It is important to have a diagram of the wiring system in a car. The wiring diagram for a 1979 GMC Jimmy can be found it is maintenance manual.
Try a JC Whitney catalog. I think they have a www but I dont have the link.
You can find a 1979 Chevrolet Camaro belt diagram at most Chevrolet dealerships. The belt diagram can also be found in Chevrolet service manuals.
It holds 6 quarts of oil.