🔧 Sonata - Fuel Cap Replacement

Replacing the fuel cap on your Sonata is a quick job: you remove the old cap and install a new one that seals correctly. A good seal prevents fuel vapor leaks and helps avoid a check-engine light related to the EVAP (fuel vapor) system.

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

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⚠️ Safety & Precautions

• ⚠️ Work in a well-ventilated area—fuel vapors are flammable.
• ⚠️ No smoking, flames, or hot work near the fuel door.
• ⚠️ Turn the car OFF before opening the fuel cap.
• ⚠️ If you smell strong fuel odor after replacement, stop and re-check the seal.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Clean shop towel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel cap (EVAP-sealing type) - Qty: 1

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📋 Before You Begin

• Park on level ground and make sure the car is completely OFF.
• Let the car sit 1–2 minutes if it was just driven, so tank vapors settle.
• Have a clean shop towel ready to wipe the filler neck sealing area.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the fuel door

• Use your hand to open the fuel door on the left-rear quarter panel.
• Put on nitrile gloves and safety glasses.

Step 2: Remove the old fuel cap

• Turn the cap counterclockwise by hand until it releases.
• If the cap has a tether (a small strap that keeps it attached), let it hang without twisting the strap.
• If you hear a hiss, that can be normal.

Step 3: Inspect and clean the sealing surfaces

• Use a clean shop towel to wipe the filler neck sealing lip (the smooth surface where the cap’s gasket seals).
• Check the old cap’s rubber gasket for cracks or flattening—this is a common cause of EVAP leak codes.

Step 4: Install the new fuel cap

• Thread the new cap on by hand clockwise.
• Tighten until it clicks several times (typically 1–3 clicks) and feels fully seated.
• If there’s a tether, make sure it isn’t pinched and the cap hangs naturally when removed.

Step 5: Close the fuel door

• Close the fuel door firmly by hand until it latches.

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✅ After Repair

• Start the car and confirm there’s no fuel smell around the fuel door.
• If you were replacing the cap due to a check-engine light, it may take several drive cycles to clear on its own.
• If the light stays on, the car may need the code cleared with a scan tool and the EVAP system checked for other leaks.

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💰 DIY vs Shop Cost

Shop Cost: $30-$90 (parts + labor)

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

You Save: $15-$45 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.2-0.5 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.