Toyota Fuel Tank Cap OEM 77300-07030 — Genuine replacement fuel cap, factory-fit seal and venting

Genuine Toyota Fuel Tank Cap (Cap Assy, Fuel Tank 77300-07030) is an OEM replacement that restores factory fit, sealing and venting for compatible Toyota models.

If your vehicle needs a direct-fit fuel tank cap replacement, this Toyota OEM cap offers the same dimensions, materials and performance as the original part installed at the factory. Unlike aftermarket alternatives, Toyota Genuine Parts are made to the manufacturer's specifications for shape, thread, venting characteristics and seal integrity. That consistency helps maintain proper fuel system pressure, reduces the chance of a check-engine light caused by an improper seal, and simplifies installation because it installs the same way your original did.

How does this cap match my original Toyota part?

The 77300-07030 cap is produced to factory tolerances so it replaces the original without modification. Toyota engineers design these caps to mate with the vehicle’s filler neck, venting system and tether attachment points exactly as the OE part did.

• Exact OEM dimensions and thread pitch for a direct fit
• Factory-specified gasket material for consistent sealing
• Built-in venting that matches original pressure relief characteristics
• Compatible tether attachment points where applicable

Will installing a Toyota OEM cap affect my vehicle’s check-engine light?

Using the correct Toyota cap reduces false evaporative-system leak codes that can trigger the check-engine light. Because the cap reproduces the original seal and venting behavior, it helps the onboard diagnostics read expected system pressures during self-tests.

• Prevents common loose-cap or improper-seal error codes
• Restores factory evaporative emission system behavior
• Helps avoid unnecessary diagnostic time and repairs

What materials and quality assurances come with the part?

Toyota Genuine Parts are manufactured to meet the brand’s quality controls and are guaranteed against defects in workmanship and materials. The cap’s body and sealing elements use durable compounds engineered to resist fuel exposure, temperature swings and repeated use over time.

• OEM-specified polymers that resist fuel and weathering
• Manufacturing inspected to Toyota quality standards
• Guaranteed against poor workmanship and material defects
• Includes original part number 77300-07030 for accurate identification

How easy is it to replace the fuel tank cap myself?

Replacing the cap is straightforward and typically requires no tools: remove the worn cap and screw the Toyota Genuine replacement into the filler neck until it seats and clicks if applicable. If your vehicle uses a tether, attach it the same way the original was connected.

• Tool-free installation in most cases
• Same installation steps as the factory cap
• No calibration or special procedures required
• Works with vehicles designed for part number 77300-07030

Who is this replacement part for? If you own a Toyota and need a reliable fuel tank cap replacement that preserves factory fit and function — whether to fix a worn seal, replace a lost cap, or prevent evaporative emission system errors — this Toyota Genuine Cap Assy, Fuel Tank 77300-07030 is intended for you. It’s suited to vehicle owners, independent mechanics and dealerships who prefer OEM components to maintain original vehicle performance and avoid compatibility problems common with aftermarket parts.