🔧 Altima - Fuel Cap Replacement

Your fuel cap seals the fuel system so fuel vapors don’t leak out and the system can hold pressure correctly. A worn, cracked, or incorrect cap can trigger an EVAP leak check engine light and may cause a fuel smell.

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

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⚠️ Safety & Precautions

• ⚠️ Work in a well-ventilated area; fuel vapors are flammable.
• ⚠️ Turn the engine off and keep sparks/flames away from the fuel door area.
• ⚠️ If the cap is stuck, don’t use excessive force that could crack the filler neck.
• Battery disconnect is not required.

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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 (EVAP-sealing type for Altima) - Qty: 1

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📋 Before You Begin

• Park on level ground and shut the engine off.
• Make sure you’re away from open flames (cigarettes, heaters, shop lights with broken lenses).
• Wipe dirt around the fuel filler area using a shop towel so debris doesn’t fall into the filler neck.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the fuel door

• Open the fuel door on the rear quarter panel.
• Use a flashlight to check for heavy dirt or damage around the filler area.

Step 2: Remove the old fuel cap

• Put on nitrile gloves.
• Turn the cap counterclockwise until it releases, then remove it.
• If the cap is tethered (attached by a small strap), let it hang without twisting the strap.

Step 3: Inspect and clean the sealing surfaces

• Use a shop towel to wipe the filler neck sealing lip (the smooth ring where the cap’s gasket seals).
• Inspect the old cap’s rubber gasket (seal). If it’s cracked, flattened, or missing, that can cause EVAP leaks.
• Tip: Dirt on the filler lip can mimic a “bad cap.”

Step 4: Install the new fuel cap

• Place the new cap onto the filler neck opening.
• Turn it clockwise until it clicks several times (you should feel/hear distinct clicks).
• Confirm the cap feels snug and does not spin freely without clicking.

Step 5: Close the fuel door and final check

• Close the fuel door securely.
• Use a flashlight to do a quick look for anything out of place.

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✅ After Repair

• Start the engine and confirm there’s no fuel smell near the fuel door.
• If you were replacing the cap due to a check engine light (EVAP leak): it may take several drive cycles for the light to turn off on its own.
• If the light stays on, the issue may be a different EVAP leak (hose, purge valve, vent valve), not the cap.

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💰 DIY vs Shop Cost

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

DIY Cost: $10-$35 (parts only)

You Save: $20-$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.