I FOUND THIS FOR A 1986 IT SHOULD BE THE SAME THEY ARE IN THE CHILTONS BOOK BUT IF YOU CAN'T GET IT YOU MAY ABLE TO AT THE LIBRARY TO COPY ALL 4.9 DIAGRAMS WILL BE THE SAME VAN / PICK-UP SO ANOTHER MODEL FORD BOOK WILL HELP YOU BUT I ACTUALLY DO HAVE ONE BUT ITS 150 MILES FROM ME IN STORAGE IN ANOTHER STATE GOOD LUCK
Google Vacuum line diagram for 87 4.9 F150, and you need to specify if it's 2wd or 4wd and with or without AC You can click on "images" and there is your answer.
Fig. 10: Vacuum diagram-1993 gasoline engines
Fig. 11: Vacuum diagram-1993 diesel engine
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