258 Jeep Vacuum Diagram. The chilton and haynes manuals help some but do not have the exact vacuum line diagram for a 1978. To check manifold pressure with a vacuum gauge you need to locate a port on the intake manifold or throttle body.
Find this pin and more on jeep by chelsie griffith. There are a couple articles below that can help you sort through those hoses and tune the carter bbd. Jeep engines do this via a large 38 or larger vacuum fitting at the base of the carburetor.
Jp 1 kit has eo.
Hook it up to the ported side of the carburator above the throttle plate. Here is a useful diagram of your exact vacuum circuit and the underhood devices. Vacuum diagram 80 258. Maybe the fsm has a better diagram.