🔧 Impreza - Fuel Cap Replacement

Replacing the fuel cap is a quick job, but it matters because a worn or incorrect cap can cause fuel vapors to leak and may turn on the check engine light (EVAP leak codes). You’ll remove the old cap, transfer/attach the tether (the little strap that keeps it from getting lost), and install the new one until it clicks.

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

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⚠️ Safety & Precautions

• ⛽ Work outdoors or in a well-ventilated area—fuel vapors are flammable.
• 🚭 No smoking, flames, or sparks near the fuel door.
• 🧯 Keep the engine OFF and let the car cool if it was just driven.
• 🧤 Wear gloves if you’re sensitive to fuel smell or residue.
• 🔋 Battery disconnect is not required.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Clean shop towel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel cap (OEM-equivalent, tethered) - Qty: 1

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📋 Before You Begin

• Park on level ground and shift to P.
• Turn the engine off and remove the key/fob from the car.
• Open the fuel door.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the old fuel cap

• Put on nitrile gloves and safety glasses.
• Turn the fuel cap counterclockwise by hand until it comes off.
• If you hear a small “whoosh,” that’s normal pressure release—pause a second and continue.

Step 2: Inspect and clean the sealing surface

• Use a clean shop towel to wipe the filler neck lip (the round surface the cap seals against).
• Look for cracks or a flattened seal on the old cap (the rubber ring). Damage here can trigger a warning light.

Step 3: Install the new fuel cap

• Make sure the tether (strap) isn’t twisted and won’t get pinched.
• Thread the new cap on by hand clockwise.
• Tighten until you hear/feel it click at least once. Clicks mean it’s sealed.

Step 4: Close up

• Hang the cap properly (if your filler door area has a cap holder) and close the fuel door.
• Wipe any fuel residue with the clean shop towel.

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✅ After Repair

• Start the engine and confirm the fuel door is fully closed.
• If you had a check engine light for a loose cap, it may take a few normal drives for the light to turn off on its own.
• If the light stays on after a few days, the issue may be elsewhere in the EVAP system and should be scanned for codes.

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💰 DIY vs Shop Cost

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

DIY Cost: $15-$45 (parts only)

You Save: $15-$45 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.