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.
See Figures 1 through 87
Fig. Fig. 1: Vacuum hose routing - 1987-88 Federal and high altitude (VIN Z) 4.3L engines with automatic transmissions (G10, 20 and 30 models)
Fig. Fig. 2: Vacuum hose routing - 1987-88 Federal and high altitude (VIN Z) 4.3L engines with manual transmissions (G10, 20 and 30 models)
Fig. Fig. 3: Vacuum hose routing - 1987-88 California (VIN Z) 4.3L engine (G10 and 20 models)
Fig. Fig. 4: Vacuum hose routing - 1987-88 Federal (VIN H) 5.0L engines with automatic transmissions (G10 and 20 models)
Fig. Fig. 5: Vacuum hose routing - 1987-88 Federal and high altitude (VIN H) 5.0L and (VIN K) 5.7L engines with automatic transmissions (G10 and 20 models)
Fig. Fig. 6: Vacuum hose routing - 1987-88 Federal and high altitude (VIN H) 5.0L engines with manual transmissions (G10 and 20 models)
Fig. Fig. 7: Vacuum hose routing - 1987-88 Federal (VIN K) 5.7L engines with automatic transmissions (G10, 20 and 30 models)
Fig. Fig. 8: Vacuum hose routing - 1987-88 California (VIN H) 5.0L and (VIN K) 5.7L VIN K engines with automatic transmissions (G10, 20 and 30 models)
Fig. Fig. 9: Vacuum hose routing - 1987-88 Federal (VIN K) 5.7L engines with manual transmissions (G30 heavy duty models)
Fig. Fig. 10: Vacuum hose routing - 1987-88 Federal (VIN K) 5.7L engines with automatic transmissions (G30 heavy duty models)
Fig. Fig. 11: Vacuum hose routing - 1987-88 California (VIN K) 5.7L engines with manual transmissions (G30 heavy duty models)
Fig. Fig. 12: Vacuum hose routing - 1987-88 California (VIN K) 5.7L engines with automatic transmissions (G30 heavy duty models)
Fig. Fig. 13: Vacuum hose routing - 1989 Federal (VIN Z) 4.3L engines with automatic transmissions (G models)
Fig. Fig. 14: Vacuum hose routing - 1989 High altitude (VIN Z) 4.3L engines with automatic transmissions (G models)
Fig. Fig. 15: Vacuum hose routing - 1989 Federal (VIN Z) 4.3L engines with manual transmissions (G models)
Fig. Fig. 16: Vacuum hose routing - 1989 High altitude (VIN Z) 4.3L engines with manual transmissions (G models)
Fig. Fig. 17: Vacuum hose routing - 1989 California (VIN Z) 4.3L engines with automatic transmissions (G models)
Fig. Fig. 18: Vacuum hose routing - 1989 Federal (VIN Z) 4.3L engines without catalyst, leaded fuel export (G models)
Fig. Fig. 19: Vacuum hose routing - 1989 Federal (VIN H) 5.0L engines with manual transmissions (G models)
Fig. Fig. 20: Vacuum hose routing - 1989 Federal (VIN K) 5.7L engines (1/2 and 3/4 ton G models)
Fig. Fig. 21: Vacuum hose routing - 1989 High altitude (VIN K) 5.7L engines (1/2 and 3/4 ton G models)
Fig. Fig. 22: Vacuum hose routing - 1989 California (VIN K) 5.7L engines (1/2, 3/4 and 1 ton G models)
Fig. Fig. 23: Vacuum hose routing - 1989 Federal (VIN K) 5.7L engines (heavy duty 1 ton G models)
Fig. Fig. 24: Vacuum hose routing - 1989 High altitude (VIN K) 5.7L engines ( 1 ton G models)
Fig. Fig. 25: Vacuum hose routing - 1989 Federal (VIN K) 5.7L engines with optional flatbed or van boxes (1 ton G models)
Fig. Fig. 26: Vacuum hose routing - 1989 High altitude (VIN K) 5.7L engines with optional flatbed or van boxes (1 ton G models)
Fig. Fig. 27: Vacuum hose routing - 1989 Federal (VIN K) 5.7L engines with optional flatbed or van boxes and option NA4 (1 ton G models)
Fig. Fig. 28: Vacuum hose routing - 1989 High altitude (VIN K) 5.7L engines (1 ton G models)
Fig. Fig. 29: Vacuum hose routing - 1989 California (VIN K) 5.7L engines with optional flatbed or van boxes (1 ton G models)
Fig. Fig. 30: Vacuum hose routing - 1989 California (VIN K) 5.7L engines with base body and option NA4 (1 ton G models)
Fig. Fig. 31: Vacuum hose routing - 1989 High altitude (VIN N)7.4L engines (G models)
Fig. Fig. 32: Vacuum hose routing - 1989 Federal and California (VIN W) 7.4L engines with chassis ratings of 14,500 or 16, 000 lbs. GVW (P models)
Fig. Fig. 33: Vacuum hose routing - 1989 Federal (VIN W) 7.4L engines with chassis ratings of 10,500 11,000, 11.000 or 12,300 lbs. GVW (P models)
Fig. Fig. 34: Vacuum hose routing - 1989 Federal and California (VIN W) 7.4L engines with chassis ratings of 14, 100 lbs. or above GVW (P models)
Fig. Fig. 35: Vacuum hose routing - 1989 California (VIN N) 7.4L engines with base chassis (G models)
Fig. Fig. 36: Vacuum hose routing - 1989 Federal and California (VIN W) 7.4L engines with chassis ratings of 12, 000 lbs. GVW (P models)
Fig. Fig. 37: Vacuum hose routing - 1989 Federal (VIN W) 7.4L engines with chassis ratings of 10,500, 11,000, 11,800 or 12,300 lbs. GVW (P models)
Fig. Fig. 38: Vacuum hose routing - 1989 Federal (VIN W) 7.4L engines with chassis ratings of 12, 000 lbs. GVW (P models)
Fig. Fig. 39: Vacuum hose routing - 1989 California (VIN W) 7.4L engines with chassis ratings of 10,500, 11,000, 11,800 or 12, 300 lbs. GVW (P models)
Fig. Fig. 40: Vacuum hose routing - 1989 California (VIN W) 7.4L engines with chassis ratings of 12, 000 lbs. GVW (P models)
Fig. Fig. 41: Vacuum hose routing - 1989 Federal (VIN C) 6.2L engines (G models)
Fig. Fig. 42: Vacuum hose routing - 1990 (VIN H) 5.0L; without AIR
Fig. Fig. 43: Vacuum hose routing - 1990 (VIN H) 5.0L; with AIR
Fig. Fig. 44: Vacuum hose routing - 1990 (VIN K) 5.7L; without AIR
Fig. Fig. 45: Vacuum hose routing - 1990 (VIN K) 5.7L; with AIR
Fig. Fig. 46: Vacuum hose routing - 1990 (VIN N) 7.4L
Fig. Fig. 47: Vacuum hose routing - 1991 (VIN Z) 4.3L; without AIR
Fig. Fig. 48: Vacuum hose routing - 1991 (VIN Z) 4.3L; with AIR
Fig. Fig. 49: Vacuum hose routing - 1991 (VIN H) 5.0L
Fig. Fig. 50: Vacuum hose routing - 1991 (VIN K) 5.7L; with AIR
Fig. Fig. 51: Vacuum hose routing - 1991 (VIN K) 5.7L; without AIR
Fig. Fig. 52: Vacuum hose routing - 1992 (VIN Z) 4.3L; without AIR
Fig. Fig. 53: Vacuum hose routing - 1992 (VIN Z) 4.3L; with AIR
Fig. Fig. 54: Vacuum hose routing - 1992 (VIN H) 5.0L
Fig. Fig. 55: Vacuum hose routing - 1992 (VIN K) 5.7L; with AIR
Fig. Fig. 56: Vacuum hose routing - 1992 (VIN K) 5.7L; without AIR
Fig. Fig. 57: Vacuum hose routing - 1992 (VIN N) 7.4L; without AIR
Fig. Fig. 58: Vacuum hose routing - 1992 (VIN N) 7.4L; with AIR
Fig. Fig. 59: Vacuum hose routing - 1993 (VIN Z) 4.3L; without AIR
Fig. Fig. 60: Vacuum hose routing - 1993 (VIN Z) 4.3L; with AIR
Fig. Fig. 61: Vacuum hose routing - 1993 (VIN Z) 4.3L; with canister purge solenoid
Fig. Fig. 62: Vacuum hose routing - 1993 (VIN H) 5.0L
Fig. Fig. 63: Vacuum hose routing - 1993 (VIN K) 5.7L; without AIR
Fig. Fig. 64: Vacuum hose routing - 1993 (VIN K) 5.7L; with AIR
Fig. Fig. 65: Vacuum hose routing - 1993 (VIN J) 6.2L
Fig. Fig. 66: Vacuum hose routing - 1993 (VIN N) 7.4L; with AIR
Fig. Fig. 67: Vacuum hose routing - 1993 (VIN N) 7.4L; without AIR
Fig. Fig. 68: Vacuum hose routing - 1994 (VIN Z) 4.3L; with canister purge valve
Fig. Fig. 69: Vacuum hose routing - 1994 (VIN Z) 4.3L; without canister purge valve
Fig. Fig. 70: Vacuum hose routing - 1994 (VIN H) 5.0L
Fig. Fig. 71: Vacuum hose routing - 1994 (VIN K) 5.7L; with AIR
Fig. Fig. 72: Vacuum hose routing - 1994 (VIN K) 5.7L; without AIR
Fig. Fig. 73: Vacuum hose routing - 1994 (VIN N) 7.4L
Fig. Fig. 74: Vacuum hose routing - 1994 (VIN F) 6.5L
Fig. Fig. 75: Vacuum hose routing - 1995 (VIN Z) 4.3L
Fig. Fig. 76: Vacuum hose routing - 1995 (VIN H) 5.0L
Fig. Fig. 77: Vacuum hose routing - 1995 (VIN K) 5.7L
Fig. Fig. 78: Vacuum hose routing - 1995 (VIN F) 6.5L
Fig. Fig. 79: Vacuum hose routing - 1995 (VIN N) 7.4L
Fig. Fig. 80: Vacuum hose routing - 1996 - 97 (VIN W) 4.3L
Fig. Fig. 81: Vacuum hose routing - 1996 - 97 (VIN M) 5.0L
Fig. Fig. 82: Vacuum hose routing - 1996 - 97 (VIN R) 5.7L; US and Canada
Fig. Fig. 83: Vacuum hose routing - 1996 - 97 (VIN R) 5.7L; Export
Fig. Fig. 84: Vacuum hose routing - 1996 - 97 (VIN F/S) 6.5L; without EGR
Fig. Fig. 85: Vacuum hose routing - 1996 - 97 (VIN F/S) 6.5L; with EGR
Fig. Fig. 86: Vacuum hose routing - 1996-97 (VIN J) 7.4L; A/T
Fig. Fig. 87: Vacuum hose routing - 1996-97 (VIN J) 7.4L; M/T
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