Vacuum Diagrams - Gasoline: Introduction

This article contains underhood views or schematics of vacuum hose routing. Vacuum diagrams are an excellent tool for identifying improperly routed vacuum hoses. Improperly routed vacuum hoses cause driveability and computer-indicated malfunctions.

Fig 1: Vacuum Diagram EVAP System, Overview

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Fig 2: Vacuum Diagram Secondary Air Injection System (2.0L)

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Fig 3: Vacuum Diagram EVAP System (GTI, Jetta & Passat: 2.8L VR6)

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Fig 4: Vacuum Diagram Secondary Air Injection System (GTI, Jetta & Passat: 2.8L VR6)

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Fig 5: Vacuum Diagram EGR System (EuroVan: 2.5L 5 Cyl. - Early Production)

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Fig 6: Vacuum Diagram EGR System (EuroVan: 2.5L 5 Cyl. - Late Production)

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Fig 7: Vacuum Diagram EVAP System

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Fig 8: Vacuum Diagram Intake Manifold (EuroVan: 2.5L 5 Cyl.)

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Fig 9: Vacuum Diagram Secondary Air Injection System (EuroVan: 2.5L 5 Cyl.)

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Fig 10: Vacuum Diagram Connecting Piece For Intake Manifold (EuroVan: 2.8L VR6, Engine Code AES)

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Fig 11: Vacuum Diagram EGR System (EuroVan: 2.8L VR6, Engine Code AES)

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Fig 12: Vacuum Diagram Fuel Pressure Regulator & Secondary Air Injection Valve (N112) (EuroVan: 2.8L VR6, Engine Code AES)

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