Following are vacuum diagrams for most of the engine and emissions package combinations covered by this guide. Because vacuum circuits will vary based on various engine and vehicle options, always refer first to the vehicle emission control information label, if present. Should the label be missing, or should vehicle be equipped with a different engine from the vehicle's original equipment, refer to the diagrams below for the same or similar configuration.
If you wish to obtain a replacement emissions label, most manufacturers make the labels available for purchase. The labels can usually be ordered from a local dealer.
Fig. Fig. 1 The Vehicle Emission Control Information (VECI) sticker is usually affixed to the radiator shroud
Fig. Fig. 2 Vapor control hose routing-1970 models
Fig. Fig. 3 Vapor control hose routing-1971 models
Fig. Fig. 4 Vapor control hose routing-1972 models. Note that the L-48 option is the Turbo Fire 350 engine (175 and 200 horsepower)
Fig. Fig. 5 Vapor control hose routing-1973 6-cylinder engines
Fig. Fig. 6 EFE system hose routing-1976 6-cylinder engines
Fig. Fig. 7 Vacuum hose routing-1976 305 and 350 2-bbl. carbureted engines
Fig. Fig. 8 Vacuum hose routing-1976 350 4-bbl. carbureted engine with EFE and AIR systems
Fig. Fig. 9 Vacuum hose routing-1976 350 4-bbl. carbureted engine without EFE or AIR systems
Fig. Fig. 10 Vacuum hose routing-1977 250 federal and high altitude engines
Fig. Fig. 11 Vacuum hose routing-1977 250 California engines
Fig. Fig. 12 Vacuum hose routing-1977 305 high altitude engines with 2-bbl. carburetors
Fig. Fig. 13 Vacuum hose routing-1977 305 federal engines with 2-bbl. carburetors
Fig. Fig. 14 Vacuum hose routing-1977 305 California engines with 2-bbl. carburetors
Fig. Fig. 15 Vacuum hose routing-1977 350 federal engines with 4-bbl. carburetors
Fig. Fig. 16 Vacuum hose routing-1977 350 high altitude engines with 4-bbl. carburetors
Fig. Fig. 17 Vacuum hose routing-1978 6-cylinder federal and high altitude engines
Fig. Fig. 18 Vacuum hose routing-1978 6-cylinder California engines
Fig. Fig. 19 Vacuum hose routing-1978 305 low altitude engines
Fig. Fig. 20 Vacuum hose routing-1978 305 high altitude engines
Fig. Fig. 21 Vacuum hose routing-1978 305 California engines
Fig. Fig. 22 Vacuum hose routing-1978 350 federal engines
Fig. Fig. 23 Vacuum hose routing-1978 350 California engines
Fig. Fig. 24 Vacuum hose routing-1979 250 (910F1H) federal engines
Fig. Fig. 25 Vacuum hose routing-1979 250 (910FI5MU) California engines
Fig. Fig. 26 Vacuum hose routing-1979 305 (91G2U) federal engines
Fig. Fig. 27 Vacuum hose routing-1979 305 (91042V) California engines
Fig. Fig. 28 Vacuum hose routing-1979 305 (910L4) federal engines
Fig. Fig. 29 Vacuum hose routing-1979 305 (910L4U) high altitude engines
Fig. Fig. 30 Vacuum hose routing-1979 305 (91014RU) California engines
Fig. Fig. 31 Vacuum hose routing-1979 305 (910Y2V) California engines
Fig. Fig. 32 Vacuum hose routing-1979 305 (910L4RU) federal engines
Fig. Fig. 33 Vacuum hose routing-1979 350 (910L4) federal engines
Fig. Fig. 34 Vacuum hose routing-1979 350 (910L4RU) California engines
Fig. Fig. 35 Vacuum hose routing-1979 350 (910L4RU) California engines
Fig. Fig. 36 Vacuum hose routing-1979 350 (910L4RU) high altitude engines
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