how to fix P0455 large EVAP leak code Ford F-150 Fourteenth Generation (2021-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent any electrical shorts during the process.

2. Inspect and Replace Gas Cap

• Tools Required: None specifically, but gloves are recommended.
• Instructions:
  1. Remove the gas cap and visually inspect the rubber seal for wear or damage.
  2. If damaged, replace the gas cap with a new OEM or quality aftermarket cap.
  3. Reinstall the gas cap and ensure it clicks securely.

3. Repair or Replace EVAP Hoses

• Tools Required: Pliers, socket set.
• Instructions:
  1. Locate the EVAP hoses connected to the charcoal canister and purge valve.
  2. Remove any damaged hoses using pliers and a socket set.
  3. Replace with new hoses, ensuring they fit tightly and securely.
  4. Reattach any clamps or brackets as necessary.

4. Repair or Replace EVAP Canister

• Tools Required: Socket set, ratchet.
• Instructions:
  1. Locate the EVAP canister, typically found under the vehicle near the fuel tank.
  2. Disconnect the electrical connectors and vacuum lines from the canister.
  3. Remove the canister mounting bolts using a socket set.
  4. Replace the canister with a new unit if it is cracked or damaged.
  5. Reinstall all components in reverse order and ensure a secure connection.

5. Smoke Test (if necessary)

• Tools Required: Smoke machine.
• Instructions:
  1. Connect the smoke machine to the EVAP system.
  2. Introduce smoke into the system and visually inspect for leaks.
  3. Repair any identified leaks by replacing or sealing the faulty components.