🔧 Traverse - Fuel Cap Replacement

On your Traverse, the “fuel cap” may be a traditional twist-on cap or a capless fuel filler system (no removable cap). First you’ll confirm which style you have, then either swap the cap in seconds or inspect/clean the capless sealing area.

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

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⚠️ Safety & Precautions

• ⚠️ Work outdoors or in a well-ventilated area.
• ⚠️ Keep away from sparks, cigarettes, or open flames.
• ⚠️ Turn the engine off before opening the fuel door.
• ⚠️ If you smell strong fuel odor after, do not drive—recheck sealing.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Shop towels
• Flashlight
• Mild soap and water

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel filler cap - Qty: 1
• Fuel door/filler pocket sealing components - Qty: 1

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📋 Before You Begin

• Park on level ground and shift to Park.
• Turn the engine off and remove the key/fob from the vehicle area.
• Open the fuel door and use a flashlight to look inside the filler opening.
• Confirm what you have: a twist-on cap (removable cap) or a capless flap (spring-loaded door inside the filler neck).

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Identify your fuel filler style

• Open the fuel door.
• If you see a removable cap you can grip and turn, follow Steps 2–4.
• If you see a spring-loaded inner flap and no removable cap, skip to Steps 5–7 (capless system).

Step 2: Remove the old twist-on fuel cap (if equipped)

• Use nitrile gloves and turn the cap counterclockwise until it comes off.
• If there is a tether (strap), let it hang so it doesn’t fall into the paint.

Step 3: Check the sealing surface

• Use a flashlight to inspect the filler neck sealing lip.
• Use shop towels lightly dampened with mild soap and water to wipe away dirt. Keep dirt out of the opening.

Step 4: Install the new twist-on fuel cap (if equipped)

• Place the new cap on and turn clockwise until it’s fully seated.
• If your cap “clicks,” keep turning until you hear/feel the clicks stop increasing (snug).
• No torque spec is used for a fuel cap—hand-tight only.

Step 5: Capless system check (if no removable cap)

• Use a flashlight to inspect the capless flap area for sand, leaves, or sticky residue.
• Use a shop towel with mild soap and water to clean the visible sealing area.
• Do not pry the flap open. (That flap is the seal that replaces a cap.)

Step 6: Verify the flap closes freely

• After cleaning, confirm the flap sits closed and looks even.
• If it looks damaged, warped, or won’t close, the fix is typically replacing the filler neck/filler pipe components (more involved than a “cap” swap).

Step 7: Close the fuel door

• Close the fuel door firmly until it latches.
• Wipe any spilled fuel immediately using shop towels.

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✅ After Repair

• Start your Traverse and make sure there’s no fuel smell around the fuel door area.
• If the Check Engine Light was on for an EVAP leak (loose cap), it may take a few drive cycles to turn off on its own.
• If the light stays on, you may need a scan to confirm the EVAP code is cleared and no leaks remain.

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💰 DIY vs Shop Cost

Shop Cost: $30-$120 (parts + labor)

DIY Cost: $10-$40 (parts only)

You Save: $20-$80 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.1-0.3 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.