[Image of a vacuum diagram for a 1977 truck]
This diagram shows the vacuum lines and connections for the various components of the engine, including the carburetor, distributor, brake booster, and emission control devices. The colors of the lines indicate the function of each line, with red lines indicating vacuum lines, blue lines indicating fuel lines, and green lines indicating coolant lines.
To use this diagram, simply locate the component you are interested in and follow the vacuum line to its source. For example, if you are looking for the vacuum line that goes to the brake booster, follow the red line from the brake booster to the carburetor.
This diagram should provide you with the information you need to troubleshoot any vacuum-related problems you may be experiencing with your 1977 truck.
