🔧 Wrangler - Fuel Cap Replacement

Replacing the fuel cap on your Wrangler is a quick job that helps keep the EVAP system sealed (the system that traps fuel vapors so they don’t vent to the air). A bad or wrong 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 with the engine OFF and away from open flames or smoking.
• 🧯 Avoid breathing fuel vapors; keep the area ventilated.
• 🧤 Wipe up any spilled fuel right away and dispose of rags safely.
• 🔋 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 towels
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

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

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📋 Before You Begin

• 🅿️ Park on level ground, shut the engine off, and remove the key.
• ⛽ If you just drove, wait a minute so pressure in the tank can settle.
• 🧼 Have shop towels ready in case there’s any fuel residue around the filler neck.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the fuel filler area

• Open the fuel door on the driver-side rear quarter.
• Use a flashlight to look for dirt/sand around the filler neck (the metal opening the cap screws onto).

Step 2: Remove the old fuel cap

• Put on nitrile gloves.
• Turn the cap counterclockwise until it comes off.
• If you hear a slight “whoosh,” that’s normal tank pressure releasing.
• Use shop towels to wipe the filler neck sealing surface clean.

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

• If your cap has a tether (the little strap that keeps it from getting lost), make sure the new cap’s tether is clipped in the same place.
• Tether prevents losing the cap off-road.

Step 4: Install the new fuel cap

• Thread the new cap on by hand (clockwise).
• Tighten until it clicks (typically 1–3 clicks). Do not keep cranking hard after it clicks.
• Make sure it sits flat and feels snug.

Step 5: Close up

• Close the fuel door.
• Use shop towels to wipe away any fingerprints or fuel residue.

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✅ After Repair

• 🚗 Start the engine and check for any fuel smell around the fuel door.
• 🛠️ If you had a check-engine light from a loose/bad cap, it may take a few drive cycles to turn off on its own.
• 🔍 If the light stays on, the issue may be another EVAP leak (not just the cap).

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💰 DIY vs Shop Cost

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

DIY Cost: $15-$35 (parts only)

You Save: $15-$55 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.