fuel

Fuel Cap

for 2023 Ford F-150 3.5L V6 EcoBoost · 4WD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Lexus & Toyota Mechanic · 20+ years

Difficulty

Easy

Time

6 min

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

This procedure covers the removal and replacement of the fuel cap on a 2021-2024 Ford F-150 with 3.5L EcoBoost engine.

Warnings

⚠Do not operate vehicle without fuel cap installed. This will trigger check engine light and allow fuel vapors to escape.

ℹ️Ensure replacement cap is specifically rated for gasoline use and meets Ford specifications.

Tools required

None required

Parts

Fuel cap × 1 — Use OEM Ford fuel cap with correct thread pitch

Preparation

Park vehicle on level surface and turn off engine
Locate fuel filler door on passenger side rear quarter panel

Procedure

1
Open fuel filler door
Press the rear edge of the fuel filler door on the passenger side of the vehicle to release the spring-loaded latch. The door will pop open.
2
Remove existing fuel cap
Turn the fuel cap counterclockwise (left) approximately 1.5-2 full rotations until it releases from the filler neck threads. The cap may have a tether attached to prevent loss.
3
Inspect filler neck
Check the fuel filler neck threads for damage, debris, or corrosion. Clean if necessary with a dry cloth. Inspect the cap tether attachment point if equipped to ensure it is secure.
4
Install new fuel cap
Align the new fuel cap with the filler neck threads and turn clockwise (right) until you hear or feel multiple clicks (typically 3-4 clicks). This indicates proper sealing. Do not over-tighten beyond the clicking point.
5
Close fuel filler door
Press the fuel filler door closed until it latches securely. Verify the door sits flush with the body panel.

Reassembly

No additional reassembly required for this procedure

Verification

Start the engine and verify no check engine light appears related to evaporative emissions system
Visually confirm fuel cap is properly seated and fuel door closes securely
If check engine light was on prior to replacement, it may take several drive cycles to clear, or use an OBD-II scanner to clear codes after verifying proper installation

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