Parts for your 2013 Mitsubishi Lancer-Fuel cap

2013 Mitsubishi Lancer fuel cap — purpose, care, and replacement

Based on technical sources, a fuel cap is absolutely used and relevant on the 2013 Mitsubishi Lancer. The 2013 Lancer Owner’s Manual (CJ/CF series, “Fuel tank cap” section) specifies a conventional, tethered, screw-on petrol cap that must be tightened until it clicks to seal the system. Mitsubishi Motors service information for the evaporative emissions (EVAP) system also relies on a correctly sealed cap for leak testing, a loose or faulty cap can trigger EVAP-related fault codes and a check engine light. Australian/New Zealand emissions rules (aligned with ADR/OBD requirements) also assume a sealed filler cap, so this model is not capless.

This Lancer’s fuel cap does more than just keep the petrol in. It seals the filler neck to stop fuel vapours escaping, protects the tank from dust and water, and allows the EVAP system to do its job properly. When the cap is tightened until it clicks, the rubber seal/O-ring creates a vapour-tight barrier. If that seal’s damaged or the cap can’t “click” home, the car can log EVAP faults (commonly small/large leak codes) and may smell of fuel around the rear quarter.

• Keeps contaminants out of the tank, helping the pump and injectors live longer
• Prevents vapour loss and fuel smell, improving comfort and economy
• Allows EVAP monitors to pass, helping avoid a check engine light

As part of routine servicing, it’s smart to give the cap a quick once-over. Wipe away grit from the filler neck, check the rubber seal for cracks or flattening, and make sure the ratchet mechanism clicks when tightened. Avoid petroleum-based lubes on the seal, if needed, a tiny smear of silicone-safe grease can help keep the O-ring supple. Ensure the tether is intact and the fuel door release works smoothly.

• Replace the cap if the seal is perished or split
• Replace if it won’t click tight or the tether is broken
• Replace if there’s a persistent fuel smell or recurring EVAP leak codes after confirming other EVAP parts are sound

For replacements, a genuine Mitsubishi cap or a quality aftermarket unit that meets EVAP sealing specs is the go. Confirm fitment by VIN for CJ/CF Lancer (2008–2017). There’s no fixed change interval, but in Aussie/Kiwi conditions many caps need replacement somewhere after 5–10 years. After refuelling, tighten until it clicks and drive a few trips to let the system recheck—no dramas.

• What fuel cap fits a 2013 Mitsubishi Lancer?
• Why does the check engine light come on after refuelling?
• How often should the fuel cap be replaced?

What fuel cap fits a 2013 Mitsubishi Lancer?
It takes a standard threaded, tethered cap designed for the CJ/CF Lancer. Use a genuine Mitsubishi part or a reputable aftermarket cap that matches the EVAP sealing spec. The simplest way to be sure is to match by VIN or build date.

Why does the check engine light come on after refuelling?
Most often it’s a loose cap or a cap that’s not sealing. Tighten it until it clicks, then drive a few normal trips so the EVAP monitor can pass. If the light returns, the cap’s seal may be worn, or there could be another EVAP leak that needs diagnosing.

How often should the fuel cap be replaced?
There’s no strict schedule. Inspect it at each service and replace if the O-ring is cracked, the ratchet won’t click, there’s a fuel smell, or EVAP leak codes persist. In local conditions, many caps are due sometime after 5–10 years.