why does my Volkswagen Golf MK7 (2015-2019) run rough after filling up with gas?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and secure with wheel chocks.

2. Inspect and Replace Fuel Filler Neck

• Tools Required: Socket set, screwdrivers.
• Remove the screws securing the fuel filler neck.
• Disconnect any attached hoses and remove the fuel filler neck.
• Inspect for cracks or blockages; replace if necessary.

3. Replace Fuel Filter

• Tools Required: Fuel line disconnect tool, wrench set, container for fuel.
• Locate the fuel filter along the fuel line.
• Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect the fuel lines using a fuel line disconnect tool.
• Replace the old fuel filter with a new one, ensuring proper orientation.

4. Inspect and Replace Fuel Pump (if needed)

• Tools Required: Socket set, multimeter.
• Access the fuel pump by removing the fuel tank access cover.
• Disconnect the electrical connector and fuel lines from the pump.
• Test the pump using a multimeter for proper voltage; replace if faulty.
• Install the new pump and reconnect all components, ensuring no leaks.

5. Check EVAP System

• Tools Required: Smoke machine (if available).
• Inspect all EVAP hoses and components for cracks or disconnections.
• Use a smoke machine to identify leaks in the EVAP system.
• Replace any damaged components such as the purge valve or charcoal canister.