🔧 CX-9 - Fuel Cap Replacement

Replacing the fuel cap is a quick job that helps keep fuel vapors sealed in the tank. A worn or incorrect cap can trigger an EVAP leak check-engine light and may cause fuel smell.

Difficulty Level: Beginner | Estimated Time: 0.1-0.3 hours

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⚠️ Safety & Precautions

• ⚠️ Work outdoors or in a well-ventilated area—fuel vapors are flammable.
• ⚠️ No smoking, sparks, or open flames near the fuel door.
• ⚠️ Let the engine cool if you just drove; avoid hot surfaces.
• ⚠️ Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Shop towel
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel cap (OEM-style, tethered) - Qty: 1

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📋 Before You Begin

• Park on level ground and shift to Park.
• Turn the ignition OFF and remove the key/fob from the vehicle area.
• If you were just fueling, wait 1-2 minutes for vapors to dissipate.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the fuel door

• Open the driver door and locate the fuel door release lever (if equipped), or press the fuel door to open it.
• Use a flashlight to clearly see the cap and tether.

Step 2: Remove the old fuel cap

• Put on nitrile gloves.
• Turn the cap counterclockwise until it releases, then pull it straight off.
• Wipe the sealing surface (the round rim where the cap seals) using a shop towel. Clean and dry is best.

Step 3: Transfer or secure the tether

• If your new cap includes a tether (the small strap that keeps you from losing the cap), attach it the same way as the original.
• If the tether snaps into a hole/slot, press it in firmly by hand until seated.
• If the tether uses a clip, press the clip into place by hand until it locks.

Step 4: Install the new fuel cap

• Place the new cap onto the filler neck.
• Turn the cap clockwise until it fully tightens and you feel/hear it “click” (this click means the seal is set).
• Close the fuel door firmly.

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✅ After Repair

• Start the engine and confirm there’s no fuel smell around the fuel door.
• If you had a check-engine light for an EVAP leak, it may take a few normal drive cycles to turn off on its own after the fix.
• If the light stays on, the issue may be another EVAP leak (hose, purge valve, canister, or filler neck seal).

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💰 DIY vs Shop Cost

Shop Cost: $40-$120 (parts + labor)

DIY Cost: $15-$45 (parts only)

You Save: $25-$75 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.2-0.4 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.