🔧 Fuel Cap - Replacement

Assumption: your Sierra has a removable, threaded fuel cap. If your truck has a capless fuel filler, there is no fuel cap to replace. This job is simple: remove the old cap, inspect the tether and seal, then install the new cap until it clicks or seats fully.

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

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⚠️ Safety & Precautions

• Work outside or in a well-ventilated area. Fuel vapors are flammable.
• Do not smoke or create sparks near the fuel filler.
• Keep the ignition off and engine off.
• No battery disconnect is required.
• Wipe dirt away before opening the fuel door.

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🔧 Required Tools

You'll need the following tools for this repair:

• None required
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel cap - Qty: 1
• Fuel cap tether - Qty: 1, if damaged

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📋 Before You Begin

• Park on level ground and shut the truck off.
• Make sure the fuel door area is clean.
• If the old cap is stuck, let it cool before forcing it.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the fuel door

• Press the fuel door to release it and open the filler area.
• Inspect the old cap, tether, and seal for cracks or wear.

Step 2: Remove the old fuel cap

• Turn the cap counterclockwise by hand until it comes off.
• If it is attached by a tether, leave the tether connected unless it is being replaced.
• Set the cap on a clean surface.

Step 3: Install the new fuel cap

• Use your hand to thread the new cap clockwise onto the filler neck.
• Tighten until it stops and clicks, if the cap is designed to click.
• Do not use tools. Hand-tight is enough.

Step 4: Close and verify

• Close the fuel door.
• Start the truck and make sure the fuel cap warning, if present, turns off after a drive cycle.
• If the warning stays on, recheck that the cap is fully seated.

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✅ After Repair

• Check that the fuel door closes properly.
• Confirm there is no fuel smell around the filler area.
• If the check engine light was on for an EVAP leak, it may take a drive cycle to clear after the repair.

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💰 DIY vs Shop Cost

Shop Cost: $40-$90 (parts + labor)

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

You Save: $30-$55 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.