🔧 Tucson - Fuel Cap Replacement

Your Tucson’s fuel cap seals the fuel tank so fuel vapors don’t leak out and the EVAP system can self-test correctly. A damaged or missing cap can trigger a check engine light and cause a fuel smell.

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, sparks, or open flames near the fuel door.
• ⚠️ Don’t top off the tank after the pump clicks off; it can damage the EVAP system.
• ⚠️ 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 (capless conversion not used) - Qty: 1
• Fuel cap tether/retainer (if damaged) - Qty: 1

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📋 Before You Begin

• Park on level ground and shut the engine off.
• If you just drove, wait a few minutes so any tank pressure can bleed off slowly.
• Open the fuel door and have a shop towel ready to wipe the filler neck area.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the old fuel cap

• Open the fuel door.
• Turn the cap counterclockwise until it releases, then remove it by hand (use nitrile gloves).
• If there’s dirt around the opening, wipe the sealing area with a shop towel.

Step 2: Inspect the sealing surfaces

• Use a flashlight to look at the filler neck lip (the round sealing surface).
• Make sure there’s no grit, rust flakes, or damage where the cap seals.
• Check the old cap’s rubber seal (the gasket). If it’s cracked, flattened, or missing, replacement was needed.

Step 3: Transfer/attach the tether (if equipped)

• If your Tucson has a tether (a small strap that keeps the cap attached), move it to the new cap if it’s removable.
• If the tether clips into the cap, press it in by hand until it snaps in place.
• Don’t force the clip; align it first.

Step 4: Install the new fuel cap

• Place the new cap on the filler neck and turn it clockwise by hand.
• Keep turning until you feel/hear it click and stop tightening after it clicks. (That “click” is the cap’s built-in limiter so you don’t over-tighten.)

Step 5: Close the fuel door

• Make sure the cap sits flat and the tether (if present) isn’t pinched.
• Close the fuel door fully.

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✅ After Repair

• Start your Tucson and confirm there is no fuel smell around the fuel door.
• If you had a check engine light for a loose cap, it may take a few normal drive cycles to turn off on its own.
• If the light stays on after a few days of mixed driving, the issue may be elsewhere in the EVAP system and should be scanned for codes.

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💰 DIY vs Shop Cost

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

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 0.2-0.5 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.