Mk4 Golf 1.8T 2004, has an issue with a consistent check engine light probably having to deal with this. These tubes coming from the fuel injection system I believe had been open.
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Volkswagen Workshop Manuals > Golf Mk4 > Engine > 5-cyl. injection engine (4-valve) > Fuel supply, gas operation > Removing and installing parts of fuel supply system > Assembly overview - fuel tank with attachments and fuel filter
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Fuel line connections at engine bay [Mk4 GTI]
