🔧 Fuel Cap - Replacement

Replacing the fuel cap on your Highlander is a simple beginner-friendly repair. A worn, loose, cracked, or missing fuel cap can cause fuel vapor leaks and may trigger a check engine light for an EVAP system leak.

Difficulty Level: Beginner | Estimated Time: 5-10 minutes

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⚠️ Safety & Precautions

• ⚠️ Work in a well-ventilated area away from flames, cigarettes, heaters, or sparks.
• ⚠️ Do not overfill the fuel tank before doing this repair.
• ⚠️ Wipe up any fuel spills immediately with a shop towel.
• ⚠️ Battery disconnect is not required for fuel cap replacement.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel filler cap - Qty: 1

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📋 Before You Begin

• Park your Highlander on level ground and shift to Park.
• Turn the engine off and remove the key from the ignition.
• Wait a minute before opening the fuel door if you recently drove, especially in hot weather.
• If the check engine light is on, the light may take several drive cycles to turn off after the new cap is installed.

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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 filler door on the driver-side rear quarter panel.
• Put on nitrile gloves and safety glasses before handling the cap area.
• Fuel vapors can irritate skin and eyes.

Step 2: Remove the Old Fuel Cap

• Use your hand to turn the fuel cap counterclockwise until it comes loose.
• A fuel cap seals the fuel tank and keeps fuel vapors inside the EVAP system; EVAP means the system that controls gasoline vapors.
• If the cap has a retaining tether, use your hand to slide or unclip the tether from the fuel door area.
• Use a shop towel to wipe dirt from around the filler neck opening.
• Do not push dirt into the filler neck.

Step 3: Inspect the Filler Neck

• Use a shop towel to clean the sealing surface where the cap gasket contacts the filler neck.
• Check for rust, heavy dirt, or damage around the sealing surface.
• If the sealing surface is damaged, the new cap may not stop an EVAP leak.
• A clean sealing surface helps prevent leaks.

Step 4: Install the New Fuel Cap

• Use your hand to attach the new fuel cap tether to the same location as the old one, if equipped.
• Place the new fuel cap onto the filler neck.
• Use your hand to turn the cap clockwise until it clicks.
• Tighten until you hear at least one click; Toyota caps are designed to click when properly seated.
• No torque wrench is used for this repair; do not force the cap after it clicks.

Step 5: Close the Fuel Door

• Use your hand to close the fuel filler door until it latches flush with the body.
• Check that the cap tether is not pinched by the fuel door.

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✅ After Repair

• Start your Highlander and confirm there is no fuel smell around the fuel door area.
• If the check engine light was caused by a loose or leaking fuel cap, it may turn off after several normal drive cycles.
• A drive cycle means starting, driving, and shutting off the vehicle after the engine warms up.
• If the check engine light stays on after a few days of normal driving, the EVAP system should be scanned for trouble codes.

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💰 DIY vs Shop Cost

Shop Cost: $40-$100 parts + labor

DIY Cost: $15-$35 parts only

You Save: $25-$65 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.2-0.3 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.