SOURCE: I NEED A FREE VACUUM
I find this information (click over pic for zoom)...
Fig. 3: 1969 Positive Crankcase Ventilation (PCV) system vacuum hose routing
Fig. 5: 1970 Vapor control system vacuum hose routing-base system shown
Fig. 6: 1970 Vapor control system vacuum hose routing-staged purge system
Fig. 7: 1970 Vapor control system and related vacuum hose routing
Hope helps (remember to rate thsi answer).
SOURCE: 1969 Datsun 1600 pickup Fast Idle
Could be the fast idle cam for the choke. When the choke is closed the fast idle cam holds the throttle open until the choke opens.
The cam should be on the opposite side of the throttle cable.
SOURCE: 73 datsun vacuum line diagram irs a L18 motor
Picture vacuum diagram is on the hoop or hirewall.
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