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Home/Cars/Ford/F-150/14th Generation (2021-2024)/why does my Ford F-150 Fourteenth Generation (2021-present) have a check engine light on after gas f...

why does my Ford F-150 Fourteenth Generation (2021-present) have a check engine light on after gas f...

Ford F-150 14th Generation (2021-2024)

Severity: mediumDifficulty: medium1-2 hours
3 min read
504 words

Problem Statement

Learn how to diagnose and fix the check engine light issue after fueling in Ford F-150 (2021-present). Step-by-step guide with diagnostic procedures and repair instructions.

Component
Fuel System
Repair Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Ensure the engine is cool before inspecting fuel components.

Symptoms

  • •Check engine light illuminated
  • •Possible fuel smell around the vehicle
  • •Engine misfire or rough idling
  • •Decreased fuel efficiency
  • •Poor acceleration performance

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to identify specific trouble codes.
  2. 2Inspect the gas cap for proper sealing and any signs of damage or wear.
  3. 3Examine the fuel system for leaks or blockages, particularly around the fuel filler neck and injectors.
  4. 4Check the EVAP (evaporative emissions control) system for faults, including the purge valve and vent valve operation.
  5. 5Monitor fuel trims using a scan tool to assess if the engine is running too rich or too lean.
  6. 6Inspect for any visible vacuum leaks in the intake manifold or associated hoses.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the negative terminal of the battery to reset the check engine light and ensure safety while working.

2. Inspect and Replace Gas Cap

  • Remove the gas cap and inspect the sealing surface for cracks or debris.
  • If damaged, replace it with a new OEM gas cap.
  • Reinstall the gas cap securely and ensure it clicks into place.

3. Check EVAP System Components

  • Locate the purge valve and vent valve in the EVAP system.
  • Use a multimeter to test the electrical connections for continuity.
  • If either valve is faulty, replace it with a new component.

4. Repair Fuel System Leaks

  • Inspect the fuel lines and connections for any signs of leaks or corrosion.
  • If leaks are found, replace the affected fuel lines or fittings.
  • Ensure all connections are tight and secure.

5. Reset Engine Control Module (ECM)

  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear any stored trouble codes.
  • Start the engine and allow it to reach operating temperature.

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
  • Screwdriver set

Parts Required

  • OEM gas cap (if needed)
  • Purge valve (if faulty)
  • Vent valve (if faulty)

Additional Information

Component

Fuel System

Repair Time

1-2 hours

Difficulty

medium

Severity

medium

Tools

4 items

Parts

3 items

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