Volkswagen Air-Cooled 1970-1981 Repair Guide

VACUUM DIAGRAMS

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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 Figure 1 through 17



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Fig. Fig. 1: Electronic fuel injection system schematic-1970-74 Type 3 and 4 Federal models (except 1974 Type 4 models equipped with auto) and 1970-71 Type 3 and 4 California models



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Fig. Fig. 2: Electronic fuel injection system schematic-1972-74 California models



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Fig. Fig. 3: Airflow controlled electronic fuel injection system schematic-1974 Type 4 models equipped with automatic transaxles and all 1975-81 models



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Fig. Fig. 4: Crankcase ventilation system schematic-1970-74 Type 1 and 2/1600 models



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Fig. Fig. 5: Crankcase ventilation system schematic-1972-74 Type 2/1700 and 2/1800 models



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Fig. Fig. 6: Crankcase ventilation system schematic-Type 3 and 4 models



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Fig. Fig. 7: Emission control system schematic-1975-81 Type 1 and 2 models



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Fig. Fig. 8: Air injection (exhaust manifold afterburning) system schematic-1973 Type 2/1700 models



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Fig. Fig. 9: Air injection (exhaust manifold afterburning) system schematic-1974 Type 2/1800 models



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Fig. Fig. 10: Exhaust Gas Recirculation (EGR) system schematic-1973 Type 2 models equipped with automatic transaxles



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Fig. Fig. 11: Exhaust Gas Recirculation (EGR) system schematic-1974 Type 2 California models equipped with manual transaxles



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Fig. Fig. 12: Vacuum operated deceleration valve system schematic-1975-81 Type 1 and 2 models equipped with manual transaxles, Type 2 models equipped with automatic transaxles after chassis No. 226 2 077 583, and Type 3 and 4 California models equipped with manual transaxles



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Fig. Fig. 13: Intake air preheating system schematic-1972-80 Type 1 models



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Fig. Fig. 14: Engine vacuum schematic-1980-81 non-California Type 2 (Vanagon) models



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Fig. Fig. 15: Engine vacuum schematic-1980-81 California Type 2 (Vanagon) models



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Fig. Fig. 16: Evaporative emissions control (EVAP) system schematic-1970-79 Type 1 and 1970-74 Type 2 models



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Fig. Fig. 17: Vacuum spark advance system schematic-all models

 
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