🔧 Fuel Cap - Replacement

Replacing the fuel cap is a quick fix if the old cap is cracked, the seal is worn, or the check engine light is on for an EVAP leak. On your Sienna, the cap is on the fuel filler neck and simply threads on and off by hand.

Difficulty Level: Beginner | Estimated Time: 0.1-0.2 hours

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⚠️ Safety & Precautions

• Work outdoors or in a well-ventilated area.
• Do not smoke or work near sparks, flames, or hot exhaust parts.
• Keep the fuel door and filler neck clean so dirt does not enter the tank.
• No battery disconnect is required.

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🔧 Required Tools

You'll need the following tools for this repair:

• Clean microfiber cloth
• Disposable gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel cap - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Make sure the fuel door is fully open.
• Wipe dirt away from the fuel filler neck before removing the old cap.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the old fuel cap

• Use your hand to turn the fuel cap counterclockwise.
• Pull the cap away from the filler neck once it unthreads.
• Do not force it.

Step 2: Inspect the filler neck and seal area

• Use a clean microfiber cloth to wipe the fuel filler neck threads and sealing surface.
• Check for dirt, cracking, or damage around the neck.

Step 3: Install the new fuel cap

• Thread the new fuel cap onto the filler neck by hand.
• Turn it clockwise until it clicks or seats firmly, depending on the cap design.
• Do not use tools to tighten it.

Step 4: Confirm the cap is sealed

• Close the fuel door.
• Start the vehicle and check that the cap warning is gone, if one was present.
• If the check engine light was on, it may take a few drive cycles to clear after the leak is fixed.

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✅ After Repair

• Make sure the fuel door closes fully.
• Check for a fuel cap warning message on the dash.
• If the check engine light stays on after a few trips, a code scan may still be needed.

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💰 DIY vs Shop Cost

Shop Cost: $70-$130 (parts + labor)

DIY Cost: $15-$40 (parts only)

You Save: $55-$90 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.1-0.2 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.