🔧 Highlander - Fuel Cap Replacement

Replacing the fuel cap on your Highlander is one of the easiest DIY repairs. A worn, cracked, loose, or missing fuel cap can cause fuel vapor leaks and may trigger a check engine light related to the EVAP system.

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

---

⚠️ Safety & Precautions

• ⚠️ Work in a well-ventilated area and keep sparks, cigarettes, and open flames away from the fuel door.
• ⚠️ Do not replace the cap while the engine is running.
• ⚠️ If you smell strong fuel odor, step away and let the area air out before continuing.
• ⚠️ Battery disconnect is not required for this repair.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel cap - Qty: 1

---

📋 Before You Begin

• Park your Highlander on level ground.
• Shift to Park and set the parking brake.
• Turn the ignition fully off and remove the key from the vehicle.
• Make sure you have the correct replacement fuel cap for your Highlander.
• The fuel cap seals the fuel tank vapor system, also called the EVAP system. EVAP means the system that keeps fuel vapors from escaping into the air.

---

🔨 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 driver-side rear quarter panel.
• No tool is needed for this step.
• Put on safety glasses and nitrile gloves before touching the fuel cap.

Step 2: Remove the Old Fuel Cap

• Use your hand to turn the old fuel cap counterclockwise until it comes loose.
• Remove the cap from the filler neck. The filler neck is the metal opening where fuel goes into the tank.
• If your old cap has a retaining tether, use your hand to slide or unclip the tether from its mounting point on the fuel door area.
• Do not force plastic clips.

Step 3: Inspect the Filler Neck

• Use your eyes and a gloved finger to check the fuel filler neck sealing surface.
• Look for dirt, rust flakes, cracks, or pieces of old rubber seal.
• If needed, wipe the sealing surface gently with a clean dry cloth.
• Do not push dirt into the filler opening.

Step 4: Install the New Fuel Cap Tether

• If the new fuel cap has a tether, use your hand to attach it to the same mounting point as the old cap.
• Make sure the tether does not twist around the cap or block the fuel door.
• No torque spec applies because this is a hand-installed part.

Step 5: Install the New Fuel Cap

• Place the new fuel cap squarely onto the filler neck by hand.
• Turn it clockwise until it clicks.
• For your Highlander, tighten the cap until you hear at least one firm click.
• Do not use pliers or any tool to tighten it.
• Torque to hand-tight only

Step 6: Close the Fuel Door

• Use your hand to close the fuel door until it sits flush with the body.
• Make sure the tether is not pinched between the fuel door and body.

---

✅ After Repair

• Start your Highlander and check that the fuel cap warning message, if present, is gone.
• If the check engine light was already on because of a loose or leaking cap, it may take several drive cycles to turn off by itself.
• A drive cycle means starting the vehicle, driving normally, and shutting it off after the engine reaches operating temperature.
• If the check engine light remains on after several days of normal driving, scan for diagnostic trouble codes.
• If codes such as EVAP small leak or gross leak return, the issue may be elsewhere in the EVAP system, not just the cap.

---

💰 DIY vs Shop Cost

Shop Cost: $40-$90 parts + labor

DIY Cost: $15-$35 parts only

You Save: $25-$55 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.

---

🎯 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.