why does my Ford F-150 13th Generation (2015-2020) check engine light turn on after I fill up gas

Ford F-150 13th Generation (2015-2020)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0456, P0457

3 min read

530 words

Problem Statement

Learn how to diagnose and fix check engine light issues related to the fuel system in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures.

Error Code

P0456, P0457

Affected Component

Fuel System

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool before inspecting fuel components to avoid burns.

Symptoms

•Check engine light illuminated
•Fuel odor near the vehicle
•Poor fuel economy
•Engine running rough or misfiring
•Difficulty starting the engine
•Evaporative emissions system error codes

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for proper sealing and any signs of damage or wear.
3
Check for fuel leaks around the fuel filler neck and fuel lines.
4
Test the EVAP components for functionality, including purge valve and vent valve.
5
Inspect the fuel tank for any signs of damage or corrosion.
6
Check for any vacuum leaks in the intake system that could affect engine performance.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Fuel line wrench

Parts Required

•New gas cap (if damaged)
•EVAP purge valve or vent valve (if faulty)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the gas cap for proper sealing and any signs of damage or wear.
3
Check for fuel leaks around the fuel filler neck and fuel lines.
4
Test the EVAP components for functionality, including purge valve and vent valve.
5
Inspect the fuel tank for any signs of damage or corrosion.
6
Check for any vacuum leaks in the intake system that could affect engine performance.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Gas Cap

Sub-steps:
- Remove the gas cap and inspect for cracks or damage.
- If necessary, replace the gas cap with a new OEM or equivalent part.
- Reinstall the gas cap, ensuring it clicks securely.
Tools Required: None specifically for this step.

3. Check and Repair EVAP System

Sub-steps:
- Locate the EVAP purge valve and vent valve; disconnect the electrical connectors.
- Use a multimeter to test the valves for proper operation.
- If faulty, replace the EVAP purge valve or vent valve as necessary.
Tools Required: Multimeter, socket set.

4. Inspect Fuel System for Leaks

Sub-steps:
- Visually inspect the fuel lines from the tank to the engine for cracks or leaks.
- Check the fuel filler neck for any signs of damage.
- Address any leaks identified by replacing damaged components.
Tools Required: Socket set, possibly a fuel line wrench.

5. Clear Error Codes

Sub-steps:
- Reconnect the negative battery terminal.
- Use the OBD-II scanner to clear the check engine light codes.
- Start the engine and monitor for any reactivation of the check engine light.
Tools Required: OBD-II scanner.