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    GM Corvette 1963-1982 Repair Guide

    VACUUM DIAGRAMS

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    Following are vacuum diagrams for most of the engine and emissions package combinations covered by this information. 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 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.

    See Figures 1 through 31

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    Fig. Fig. 1: 1966-67 Positive Crankcase Ventilation (PCV) system vacuum hose routing



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    Fig. Fig. 2: 1968 Positive Crankcase Ventilation (PCV) system vacuum hose routing



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    Fig. Fig. 3: 1969 Positive Crankcase Ventilation (PCV) system vacuum hose routing



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    Fig. Fig. 4: 1970 Positive Crankcase Ventilation (PCV) system vacuum hose routing



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    Fig. Fig. 5: 1970 Vapor control system vacuum hose routing-base system shown



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    Fig. Fig. 6: 1970 Vapor control system vacuum hose routing-staged purge system



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    Fig. Fig. 7: 1970 Vapor control system and related vacuum hose routing



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    Fig. Fig. 8: 1971-73 PCV system vacuum hose routing. Note that Corvette uses a PCV system with a different type of fresh air hose connection. There is no PCV filter, only a flame arrester



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    Fig. Fig. 9: 1971 Corvette vacuum hose routing



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    Fig. Fig. 10: 1971 Corvette vapor control hose routing



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    Fig. Fig. 11: 1972 vapor control vacuum hose routing-350 engine shown



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    Fig. Fig. 12: 1972 vapor control vacuum hose routing-454 engine shown



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    Fig. Fig. 13: 1976 350 engine vacuum hose routing-4-bbl. carbureted with EFE and air injection



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    Fig. Fig. 14: 1976 350 engine vacuum hose routing-4-bbl. carbureted without EFE or air injection



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    Fig. Fig. 15: 1976 350 engine vacuum hose routing-with fuel injection



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    Fig. Fig. 16: 1977 350 engine vacuum hose routing-49 state 4-bbl. carbureted



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    Fig. Fig. 17: 1977 350 engine vacuum hose routing-high altitude 4-bbl. carbureted



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    Fig. Fig. 18: 1978 350 engine vacuum hose routing-49 state



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    Fig. Fig. 19: 1978 350 engine vacuum hose routing-California



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    Fig. Fig. 20: 1979 350 (910L4) engine vacuum hose routing-Federal



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    Fig. Fig. 21: 1979 350 (910L4RU) vacuum hose routing-California



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    Fig. Fig. 22: 1979 350 (910L4RU) vacuum hose routing-California



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    Fig. Fig. 23: 1979 350 (910L4RU) engine vacuum hose routing-High Altitude



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    Fig. Fig. 24: 1980 350 (910L4RU) engine vacuum hose routing-Federal



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    Fig. Fig. 25: 1980 350 (910L4) engine vacuum hose routing-Federal



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    Fig. Fig. 26: 1980 350 (910L4RU) engine vacuum hose routing-California



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    Fig. Fig. 27: 1980 350 (910L4RU) engine vacuum hose routing-High altitude



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    Fig. Fig. 28: 1981-82 Evaporative Emission Control System (EECS) vacuum hose routing-closed canister system



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    Fig. Fig. 29: 1981-82 Evaporative Emission Control System (EECS) vacuum hose routing-open canister system



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    Fig. Fig. 30: 1981-82 Air Management system vacuum hose routing-cold engine mode



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    Fig. Fig. 31: 1981-82 Air Management system vacuum hose routing-warm engine mode

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