why does my Volkswagen Passat B8 (2015-2022) have a rough start after filling gas?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is turned off.
• Disconnect the battery before starting work on electrical systems.

2. Inspect and Replace Fuel Cap

• Sub-steps:
  1. Locate the fuel cap and remove it.
  2. Inspect the cap for cracks or damage; replace if necessary.
  3. Reinstall the fuel cap securely and ensure it clicks into place.

3. Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit, compressed air, safety goggles.
• Sub-steps:
  1. Remove the fuel rail to access the injectors (refer to service manual for specific steps).
  2. Use a fuel injector cleaner and follow the product instructions to clean each injector.
  3. Reinstall the injectors and fuel rail, ensuring all connections are tight.

4. Check and Replace Fuel Filter (if necessary)

• Sub-steps:
  1. Locate the fuel filter (usually along the fuel line).
  2. Prepare a catch pan to collect any spilled fuel.
  3. Disconnect the fuel lines from the filter using appropriate tools.
  4. Replace the old filter with a new one and reconnect the lines securely.

5. Inspect and Repair EVAP System

• Sub-steps:
  1. Check the fuel cap for a proper seal and replace if needed.
  2. Inspect the EVAP purge valve for proper function; replace if defective.
  3. Use a smoke machine to detect any leaks in the EVAP system.