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 Vacuum hose schematic-1969-75 6 cylinder 250 engines
Fig. Fig. 2 Vacuum hose schematic-1969-75 V8 engines
Fig. Fig. 3 Vacuum hose schematic-1976 V8 350 engine 4-bbl (2WD Federal with AIR)
Fig. Fig. 4 Vacuum hose schematic-1976 V8 350 engine 4-bbl (Federal 2WD without AIR)
Fig. Fig. 5 Vacuum hose schematic-1976 V8 350 engine 4-bbl (Federal 4WD)
Fig. Fig. 6 Vacuum hose schematic-1976 V8 350 engine 4-bbl (California 4WD)
Fig. Fig. 7 Vacuum hose schematic-1976 V8 400 engine (Federal light and heavy duty 4WD without AIR)
Fig. Fig. 8 Vacuum hose schematic-1976 V8 400 engine (California light and heavy duty 4WD)
Fig. Fig. 9 Vacuum hose schematic-1977 6 cylinder 250 engine, light duty emissions
Fig. Fig. 10 Vacuum hose schematic-1977 6 cylinder 250 engine; heavy duty emissions (except California)
Fig. Fig. 11 Vacuum hose schematic-1977 305 engine; light duty low altitude emissions
Fig. Fig. 12 Vacuum hose schematic-1977 305 engine; heavy duty emissions
Fig. Fig. 13 Vacuum hose schematic-1977 350 engine; light duty, high altitude and California emissions
Fig. Fig. 14 Vacuum hose schematic-1977 350 engine; light duty low altitude emissions
Fig. Fig. 15 Vacuum hose schematic-1977 350 and 400 engines; heavy duty emissions (except California)
Fig. Fig. 16 Vacuum hose schematic-1977 350 and 400 engines; heavy duty emissions (California)
Fig. Fig. 17 Vacuum hose schematic-1977 400 engine; heavy duty California emissions with A/C
Fig. Fig. 18 Vacuum hose schematic-1978 250 engine; light duty emissions (except California)
Fig. Fig. 19 Vacuum hose schematic-1978 250 engine; light duty emissions (California)
Fig. Fig. 20 Vacuum hose schematic-1978 250 engine; heavy duty emissions (except California)
Fig. Fig. 21 Vacuum hose schematic-1978 305 engine; light duty, low altitude emissions
Fig. Fig. 22 Vacuum hose schematic-1978 305 engine; heavy duty emissions
Fig. Fig. 23 Vacuum hose schematic-1978 350 engine; light duty, low altitude emissions
Fig. Fig. 24 Vacuum hose schematic-1978 350 engine; light duty emissions (California)
Fig. Fig. 25 Vacuum hose schematic-1978 350 and 400 engines; light duty emissions with A/C
Fig. Fig. 26 Vacuum hose schematic-1978 350 and 400 engines; heavy duty emissions with A/C
Fig. Fig. 27 Vacuum hose schematic-1978 350 and 400 engines; light duty emissions with A/C (California)
Fig. Fig. 28 Vacuum hose schematic-1978 350 and 400 engines; heavy duty emissions with A/C (California)
Fig. Fig. 29 Vacuum hose schematic-1978 two canister EVAP system
Fig. Fig. 30 Vacuum hose schematic-1979 models
Fig. Fig. 31 Vacuum hose schematic-1979 models
Fig. Fig. 32 Vacuum hose schematic-1979 models
Fig. Fig. 33 Vacuum hose schematic-1979 models
Fig. Fig. 34 Vacuum hose schematic-1979 models
Fig. Fig. 35 Vacuum hose schematic-1979 models
Fig. Fig. 36 Vacuum hose schematic-1979 models
Fig. Fig. 37 Vacuum hose schematic-1979 models
Fig. Fig. 38 Vacuum hose schematic-1979 models
Fig. Fig. 39 Vacuum hose schematic-1979 models
Fig. Fig. 40 Vacuum hose schematic-1980 6 cylinder 250 engine; single fuel evaporation canister with M/T (Federal)
Fig. Fig. 41 Vacuum hose schematic-1980 6 cylinder 250 engine; dual fuel evaporation canister with A/T (Federal)
Fig. Fig. 42 Vacuum hose schematic-1980 6 cylinder 250 engine; dual fuel evaporation canister with M/T (Federal)
Fig. Fig. 43 Vacuum hose schematic-1980 6 cylinder 250 engine (California)
Fig. Fig. 44 Vacuum hose schematic-1980 6 cylinder 250 engine; single fuel evaporation canister with A/T (Federal)
Fig. Fig. 45 Vacuum hose schematic-1980 V8 305 engine; single fuel evaporation canister with M/T (Federal)
Fig. Fig. 46 Vacuum hose schematic-1980 V8 305 engine; single fuel evaporation canister with A/T (Federal)
Fig. Fig. 47 Vacuum hose schematic-1980 V8 305 engine; dual fuel evaporation canister with M/T (Federal)
Fig. Fig. 48 Vacuum hose schematic-1980 V8 305 engine; dual fuel evaporation canister with A/T (Federal)
Fig. Fig. 49 Vacuum hose schematic-1980 V8 350 engine; heavy duty emissions (Federal)
Fig. Fig. 50 Vacuum hose schematic-1980 V8 350 engine; dual fuel evaporation canister with A/T and AIR (Federal)
Fig. Fig. 51 Vacuum hose schematic-1980 V8 350 engine with M/T (California)
Fig. Fig. 52 Vacuum hose schematic-1980 V8 350 engine; dual fuel evaporation canister with A/T and without AIR (Federal)
Fig. Fig. 53 Vacuum hose schematic-1980 V8 350 engine; A/T and in-line diverter valve (California)
Fig. Fig. 54 Vacuum hose schematic-1980 V8 350 engine; heavy duty emissions (California)
Fig. Fig. 55 Vacuum hose schematic-1980 V8 350 engine; A/T and pump mounted diverter valve (California)
Fig. Fig. 56 Vacuum hose schematic-1980 V8 350 engine; single fuel evaporation canister with M/T and AIR (Federal)
Fig. Fig. 57 Vacuum hose schematic-1980 V8 350 engine; dual fuel evaporation canister with M/T and without AIR (Federal)
Fig. Fig. 58 Vacuum hose schematic-1980 V8 350 engine; single fuel evaporation canister with M/T and AIR (Federal)
Fig. Fig. 59 Vacuum hose schematic-1980 V8 350 engine; single fuel evaporation canister with A/T and AIR (Federal)
Fig. Fig. 60 Vacuum hose schematic-1980 V8 350 engine; dual fuel evaporation canister with M/T and AIR (Federal)
Fig. Fig. 61 Vacuum hose schematic-1980 V8 350 engine; single fuel evaporation canister with A/T and without AIR (Federal)
Fig. Fig. 62 Vacuum hose schematic-1980 V8 400 engine; heavy duty emissions with A/T (Federal)
Fig. Fig. 63 Vacuum hose schematic-1980 V8 400 engine; heavy duty emissions with A/T (California)
Fig. Fig. 64 Vacuum hose schematic-1980 V8 400 engine; single fuel evaporation canister with A/T (Federal)
Fig. Fig. 65 Vacuum hose schematic-1980 V8 400 engine; single fuel evaporation canister with M/T (Federal)
Fig. Fig. 66 Vacuum hose schematic-1981 6 cylinder 250 engine; A/T without AIR (Federal)
Fig. Fig. 67 Vacuum hose schematic-1981 6 cylinder 250 engine; A/T with AIR (Federal)
Fig. Fig. 68 Vacuum hose schematic-1981 6 cylinder 250 engine; A/T and auxiliary tank (Federal)
Fig. Fig. 69 Vacuum hose schematic-1981 6 cylinder 250 engine with M/T (Federal and California)
Fig. Fig. 70 Vacuum hose schematic-1981 6 cylinder 250 engine; M/T and auxiliary tank (Federal and California)
Fig. Fig. 71 Vacuum hose schematic-1981 6 cylinder 250 engine with A/T (Federal and California)
Fig. Fig. 72 Vacuum hose schematic-1981 6 cylinder 250 engine; A/T and auxiliary tank (Federal and California)
Fig. Fig. 73 Vacuum hose schematic-1981 6 cylinder 250 engine; M/T with auxiliary tank (Federal)
Fig. Fig. 74 Vacuum hose schematic-1981 6 cylinder 250 engine; M/T without auxiliary tank (Federal)
Fig. Fig. 75 Vacuum hose schematic-1981 6 cylinder 250 engine; with A/T (Federal)
Fig. Fig. 76 Vacuum hose schematic-1981 6 cylinder 250 engine; A/T with AIR (Federal)
Fig. Fig. 77 Vacuum hose schematic-1981 V8 305 engine with A/T (Federal)
Fig. Fig. 78 Vacuum hose schematic-1981 V8 305 engine; with M/T (Federal)
Fig. Fig. 79 Vacuum hose schematic-1981 V8 305 engine; M/T with AIR (Federal)
Fig. Fig. 80 Vacuum hose schematic-1981 V8 305 engine with M/T (Federal)
Fig. Fig. 81 Vacuum hose schematic-1981 V8 305 engine; A/T with AIR (Federal and California)
Fig. Fig. 82 Vacuum hose schematic-1981 V8 305 engine; A/T with AIR (Federal and California)
Fig. Fig. 83 Vacuum hose schematic-1981 V8 350 engine; A/T with AIR (Federal)
Fig. Fig. 84 Vacuum hose schematic-1981 V8 350 engine; M/T with AIR (Federal)
Fig. Fig. 85 Vacuum hose schematic-1981 V8 350 engine with A/T (Federal heavy duty)
Fig. Fig. 86 Vacuum hose schematic-1981 V8 350 engine with AIR (Federal)
Fig. Fig. 87 Vacuum hose schematic-1981 V8 350 engine with AIR (Federal)
Fig. Fig. 88 Vacuum hose schematic-1981 V8 350 engine (Federal and California)
Fig. Fig. 89 Vacuum hose schematic-1981 V8 350 engine with M/T (Federal)
Fig. Fig. 90 Vacuum hose schematic-1982 6 cylinder 250 engine with A/T and auxiliary canister (Federal and high altitude)
Fig. Fig. 91 Vacuum hose schematic-1982 6 cylinder 250 engine with A/T (Federal and high altitude)
Fig. Fig. 92 Vacuum hose schematic-1982 6 cylinder 250 engine with A/T (Federal and high altitude)
Fig. Fig. 93 Vacuum hose schematic-1982 6 cylinder 250 engine with A/T and auxiliary canister (Federal and high altitude)
Fig. Fig. 94 Vacuum hose schematic-1982 6 cylinder 250 engine with A/T (Federal)
Fig. Fig. 95 Vacuum hose schematic-1982 6 cylinder 250 engine with M/T (Federal)
Fig. Fig. 96 Vacuum hose schematic-1982 6 cylinder 250 engine with A/T and auxiliary canister (Federal)
Fig. Fig. 97 Vacuum hose schematic-1982 6 cylinder 250 engine with M/T (Federal)
Fig. Fig. 98 Vacuum hose schematic-1982 V8 305 engine with M/T (high altitude)
Fig. Fig. 99 Vacuum hose schematic-1982 V8 305 engine with M/T (Federal and high altitude)
Fig. Fig. 100 Vacuum hose schematic-1982 V8 305 engine with M/T
Fig. Fig. 101 Vacuum hose schematic-1982 V8 305 engine with A/T (Federal and high altitude)
Fig. Fig. 102 Vacuum hose schematic-1982 V8 305 engine, except AIR (Federal)
Fig. Fig. 103 Vacuum hose schematic-1982 V8 305 engine with A/T (high altitude)
Fig. Fig. 104 Vacuum hose schematic-1982 V8 350 engine with A/T (California)
Fig. Fig. 105 Vacuum hose schematic-1982 V8 305 engine with M/T (Federal)
Fig. Fig. 106 Vacuum hose schematic-1982 V8 350 engine with M/T (Federal and high altitude)
Fig. Fig. 107 Vacuum hose schematic-1982 V8 350 engine with A/T (Federal)
Fig. Fig. 108 Vacuum hose schematic-1982 V8 350 engine with A/T (Federal and high altitude)
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