Parts for your 2013 Subaru Legacy-Fuel cap

2013 Subaru Legacy fuel cap

Yes, the 2013 Subaru Legacy uses a conventional, screw-on fuel filler cap. Subaru’s own technical literature backs this up: the 2013 Legacy Owner’s Manual includes a “Fuel filler lid and cap” section with the familiar instruction to tighten the cap until it clicks, and Subaru service diagnostics note that EVAP system alerts can be triggered by a loose or worn cap.

For anyone looking after their 2013 Subaru Legacy (known as Liberty in Australia), the fuel cap does a lot more than just close the filler neck. It seals the tank to keep petrol vapours from escaping, which helps the car’s EVAP emissions system do its job and prevents that whiff of fuel around the rear quarter. A healthy cap protects fuel quality, reduces evaporation losses, and helps avoid that pesky check engine light after a servo stop.

As part of regular servicing, it’s smart to give the cap a quick once-over. Make sure it tightens smoothly and clicks into place, the tether isn’t frayed, and the rubber sealing ring isn’t cracked, flattened, or swollen. A light wipe with a clean, dry cloth keeps grit off the seal. Avoid lubricants or petroleum jelly on the gasket—if the seal is damaged, replacement is the proper fix.

Many “EVAP leak” warnings (like a loose cap message or an engine light soon after refuelling) come down to a cap that wasn’t tightened fully, or a seal that’s past its best. If the Legacy throws an evap-related fault shortly after a fill, re-seat and tighten the cap until it clicks several times, drive for a few trips, and see if the warning clears. If it keeps coming back, a new cap is inexpensive and often restores proper system pressure.

• Inspect the cap at each 10,000–15,000 km service or twice a year.
• Replace the cap if the click mechanism fails, the seal is perished, fuel smells persist, or EVAP faults recur.
• Choose a genuine Subaru or quality direct-fit cap to ensure correct venting and emissions performance.

It’s a small part that quietly protects fuel economy, emissions, and the absence of dramas on the dash—well worth a minute’s attention during routine maintenance.

Popular questions about 2013 Subaru Legacy fuel caps

Is the 2013 Subaru Legacy capless or does it use a standard cap?
It uses a standard, tethered screw-on cap. Subaru’s 2013 Owner’s Manual specifically instructs tightening the cap until it clicks, and the EVAP system will complain if the cap is loose or the seal is compromised.

How can someone tell if the fuel cap needs replacing?
Look for a cap that won’t click tight, a cracked or flattened rubber seal, recurring fuel smells near the filler, or repeated EVAP/loose-cap warnings after refuelling. If cleaning the seal and refitting doesn’t help, replacing the cap is the straightforward cure.

Does an aftermarket cap work, or should they use a genuine Subaru cap?
Quality direct-fit aftermarket caps generally work fine, but a genuine Subaru cap guarantees the correct seal and venting characteristics for the Legacy’s EVAP system. If the vehicle is sensitive to EVAP readiness, opting for OEM can save time and hassle.