🔧 Gladiator - Fuel Cap Replacement

Replacing the fuel cap on your Gladiator is a quick job: you remove the old cap and install a new one that seals correctly. A good seal helps prevent fuel vapor leaks, check-engine lights, and fuel smell.

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

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⚠️ Safety & Precautions

• ⚠️ Work outside or in a well-ventilated area away from flames or smoking.
• ⚠️ Turn the engine OFF before opening the fuel door.
• ⚠️ If you smell strong fuel, stop and let vapors clear.
• ⚠️ No battery disconnect is required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Clean shop towel
• Plastic trim tool (specialty)
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel filler cap (gas cap) for Gladiator - Qty: 1

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📋 Before You Begin

• Park on level ground and shut the engine off.
• Let the truck sit 1-2 minutes if you just drove it.
• Open the fuel door and wipe around the filler opening with a clean shop towel.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the fuel door

• Open the fuel door by hand.
• Use a flashlight to look for dirt or damage around the filler neck (the metal tube you fuel through).

Step 2: Remove the old fuel cap

• Turn the cap counterclockwise by hand until it releases.
• If your cap has a tether (the small strap that keeps it from getting lost), let it hang without twisting it.
• If it’s stuck, turn slowly and steadily.

Step 3: Inspect and clean the sealing area

• Use a clean shop towel to wipe the sealing surface on the filler neck (the smooth ring the cap seals against).
• Look at the old cap’s rubber seal (the gasket). If it’s cracked, flattened, or missing, that can cause an EVAP leak and a check-engine light.

Step 4: Transfer the tether (if required)

• If the new cap does not include a tether and your old cap uses one, move it over carefully.
• Use a plastic trim tool (specialty) to gently pry the tether clip loose if it’s clipped to the cap. (A plastic trim tool is a non-metal pry tool that helps prevent scratches.)
• Do not use a metal screwdriver here—it's easy to damage the plastic.

Step 5: Install the new fuel cap

• Thread the new cap on by hand, turning clockwise.
• Tighten until you feel it fully seat; if it’s a ratcheting-style cap, keep turning until it clicks a few times.
• Start threads gently to avoid cross-threading.

Step 6: Close the fuel door

• Close the fuel door firmly by hand.
• Use a flashlight to confirm the cap is seated and the tether (if equipped) isn’t pinched.

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✅ After Repair

• Start the engine and verify there’s no fuel smell around the fuel door.
• If you had a check-engine light for a loose cap, it may take a few drive cycles to clear on its own.
• If the light stays on, you’ll likely need the code read—an EVAP leak can have other causes besides the cap.

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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 0.1-0.2 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.