🔧 Impreza - Fuel Cap Replacement

The fuel cap seals your fuel tank so the EVAP system can hold pressure and prevent fuel vapors from escaping. A worn or incorrect cap can trigger a check-engine light (often an EVAP leak) and may cause a fuel smell.

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

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⚠️ Safety & Precautions

• ⚠️ Work outdoors or in a well-ventilated area
• ⚠️ Keep away from sparks, cigarettes, and open flames
• ⚠️ Don’t replace the cap right after driving; let the area cool
• ⚠️ No battery disconnect is 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 (OEM-equivalent, tethered) - Qty: 1

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📋 Before You Begin

• Park your Impreza on level ground and turn the engine off
• Make sure the fuel door area is clean and dry
• If your check-engine light is on for an EVAP issue, plan to drive a few normal trips after replacement; the system may need time to re-check itself

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the fuel door

• Use your hand to open the fuel door on the left rear quarter panel
• Use a flashlight to look for dirt around the cap area

Step 2: Remove the old fuel cap

• Use your hand to turn the cap counterclockwise (left) until it comes off
• If you hear a short hiss, that can be normal pressure equalizing
• Use a shop towel to wipe the sealing surface (the flat ring where the cap seats)

Step 3: Inspect the sealing surfaces

• Use the flashlight to check the filler neck for cracks, heavy rust, or debris
• Check the old cap’s rubber seal (gasket) for cracks, flattening, or missing pieces
• Clean and dry surfaces seal best.

Step 4: Install the new fuel cap

• Put on nitrile gloves if you haven’t already
• Align the new cap and use your hand to turn it clockwise (right)
• Tighten until you hear/feel it click several times (this is the cap’s clutch; it prevents over-tightening)
• No torque spec applies; the “clicks” are the correct tightening method

Step 5: Confirm the tether is secure

• If your cap has a tether (the small strap that keeps it from getting lost), make sure it’s not twisted and won’t get pinched by the fuel door
• Close the fuel door firmly with your hand

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✅ After Repair

• Start the engine and confirm there’s no fuel smell around the fuel door
• If a check-engine light was on for a loose cap/EVAP small leak, it may turn off after several drive cycles
• If the light stays on after a few days of normal driving, the issue may be a different EVAP leak (hose, purge valve, vent valve)

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💰 DIY vs Shop Cost

Shop Cost: $40-$120 (parts + labor)

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

You Save: $25-$75 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.