🔧 GLA - Fuel Cap Replacement

Replacing the fuel cap on your GLA is a quick job that helps prevent fuel vapor leaks and check-engine warnings caused by a bad seal. You’ll remove the old cap, transfer/keep the tether (the little retaining strap), and install the new cap until it clicks.

Difficulty Level: Beginner | Estimated Time: 0.1-0.3 hours

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⚠️ Safety & Precautions

• ⚠️ Work in a well-ventilated area; fuel vapors are flammable.
• ⚠️ Engine OFF and no smoking/open flames nearby.
• ⚠️ Don’t top off fuel; stop at the first pump click to protect the EVAP system.
• ⚠️ Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Clean shop towel
• Small flathead screwdriver
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel filler cap (OEM-style, sealed) - Qty: 1
• Fuel cap tether/retainer strap (if damaged) - Qty: 1

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📋 Before You Begin

• Park on level ground and shift to Park.
• Press the fuel door to open it (your GLA uses a push-to-open fuel door when unlocked).
• Wipe dirt off the area around the cap using a clean shop towel.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the old fuel cap

• Open the fuel door.
• Turn the cap counterclockwise by hand until it releases, then remove it.
• Set it where it won’t pick up dirt.

Step 2: Inspect and clean the sealing surfaces

• Use a flashlight to look at the filler neck opening (where the cap seals).
• Use a clean shop towel to wipe the sealing lip and threads.
• Keep dirt out of the filler neck.

Step 3: Transfer or unclip the tether (if equipped)

• The tether is the small strap that keeps the cap from getting lost.
• If the tether clips onto the cap, gently pry the clip open using a small flathead screwdriver, then move it to the new cap.
• If the tether is molded into the old cap and your new cap includes a tether, skip this step.

Step 4: Install the new fuel cap correctly

• Thread the new cap on by hand (clockwise).
• Continue turning until you feel/hear at least one click. That click means the cap is tight enough.
• Close the fuel door firmly until it latches.

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✅ After Repair

• Start the engine and confirm there’s no fuel smell around the fuel door area.
• If you had a check-engine light from a loose cap, it may take a few normal drive cycles to clear on its own after the new cap is installed.
• If the light stays on, you may need a scan tool to clear the code and verify no EVAP leaks remain.

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💰 DIY vs Shop Cost

Shop Cost: $60-$180 (parts + labor)

DIY Cost: $20-$60 (parts only)

You Save: $40-$120 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.2-0.5 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.