Toyota Fuel Tank Cap Assembly 77310-48020 — OEM replacement gas cap, factory-sealed fit and venting

Genuine Toyota fuel tank cap assembly (part 77310-48020) — an OEM replacement gas cap engineered to restore proper sealing, venting, and fit for compatible Toyota models.

If your vehicle needs a like-for-like fuel cap replacement, this factory Toyota assembly brings original-spec fit and function. Sold new in Toyota packaging, the cap is designed to match factory dimensions and materials so it snaps, seals, and vents the way your vehicle expects. That reduces fuel odor, minimizes evaporation-related fuel loss, and helps maintain correct evaporative-emissions system behavior without aftermarket guesswork.

How will this OEM cap fit my Toyota?

This cap is the exact Toyota part number 77310-48020 and replaces factory-installed caps that use the same assembly dimensions and mounting interface. Fitment is straightforward and direct—no adapters or modifications required.

• Factory part number: 77310-48020 for precise compatibility
• Designed to match original thread and retention geometry
• Simple twist-and-lock installation with factory tether or bracket

What materials and build quality can I expect?

The cap is manufactured to original equipment standards using automotive-grade plastics and sealing materials. Build quality aims to match the performance of the cap your vehicle left the factory with.

• OEM construction for consistent sealing and venting
• Durable plastic body and gasket for long-term resistance to fuel and weather
• Produced under Toyota quality controls and shipped in genuine packaging

How do I install the replacement fuel tank cap?

Installation is quick and requires no special tools: remove the old cap, check the filler neck and gasket surface for debris, then thread the new cap until it clicks or seats firmly. Confirm the tether or retaining bracket is secured if your vehicle uses one.

• Hand-tighten until the cap seats or clicks to ensure proper seal
• Inspect fuel-filler gasket and clean any dirt to prevent leaks
• Check for warning lights—clear any EVAP-related codes if present after replacement

Why choose a genuine Toyota assembly instead of aftermarket options?

Using a Toyota OEM cap minimizes fitment surprises and maintains original venting characteristics designed for the vehicle’s evaporative-emissions system. It also preserves factory part traceability and quality assurance.

• Exact OEM specification reduces risk of check-engine lights from EVAP mismatch
• Manufactured and packaged under Toyota standards for consistency
• Easy, drop-in replacement that keeps your service history aligned with factory parts

Who is this for: Drivers and technicians seeking a reliable, factory-spec fuel tank cap replacement for compatible Toyota vehicles. Ideal for owners who prefer genuine parts for proper sealing and emissions-system compatibility, fleet managers maintaining service standards, and DIYers who want an exact-fit gas cap without modification.