This procedure covers the removal and replacement of the fuel cap on a 2015-2020 Ford F-150 with 3.5L EcoBoost engine.

Warnings

Tools required

Parts

• Fuel cap × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and ensure engine is off
2. Open fuel filler door located on driver's side rear quarter panel

Procedure

1. 1

   Remove old fuel cap
   Turn the fuel cap counterclockwise until it releases from the fuel filler neck. The cap may click several times during removal, which is normal. Continue turning until cap is free from the filler neck threads.
2. 2

   Inspect fuel filler neck
   Examine the fuel filler neck threads for damage, corrosion, or debris. Wipe clean with a shop towel if necessary. Check the rubber seal inside the filler neck for cracks or deterioration.
3. 3

   Install new fuel cap
   Align the new fuel cap with the filler neck and turn clockwise. Tighten until you hear at least 3 distinct clicks. This ensures the cap is properly seated and the evaporative emissions system will seal correctly.
4. 4

   Close fuel filler door
   Push the fuel filler door closed until it latches securely. Verify the door sits flush with the body panel.

Reassembly

1. No reassembly required for this procedure

Verification

• Verify fuel cap is tightened until you hear at least 3 clicks
• Confirm fuel filler door closes and latches properly
• If check engine light was on due to loose fuel cap, it may take several drive cycles to clear automatically, or use a scan tool to clear codes after verifying cap is properly installed

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