why does my Ford Mustang S650 (2024-Present) engine light come on after filling gas?

Solution

1. Preparation

• Gather tools including an OBD-II scanner, fuel pressure gauge, and basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts during repairs.

2. Inspect and Replace Gas Cap

• Sub-steps:
  1. Remove the gas cap and visually inspect it for cracks or wear.
  2. Clean the gas cap and the filler neck with a cloth to ensure a tight seal.
  3. If damaged, replace the gas cap with an OEM part.
  4. Reinstall the gas cap securely until it clicks.

3. Check and Repair EVAP System

• Sub-steps:
  1. Inspect EVAP hoses for cracks or disconnections.
  2. Use a smoke machine if available to detect leaks in the EVAP system.
  3. Replace any faulty components, such as the purge valve or EVAP canister.
  4. Clear any diagnostic trouble codes using the OBD-II scanner after repairs.

4. Test Fuel System

• Sub-steps:
  1. Attach a fuel pressure gauge to the fuel rail.
  2. Start the engine and observe the fuel pressure; it should match the manufacturer's specifications.
  3. If the pressure is low, check the fuel pump and filter for blockages or failure.
  4. Replace the fuel filter if clogged or the fuel pump if defective.