Parts for your 2010 Toyota Bb-Fuel cap

2010 Toyota bB fuel-cap — fitted and essential

Yes, the 2010 Toyota bB uses a conventional threaded fuel-filler cap. This is supported by Toyota service literature for the bB (QNC2# series, circa 2005–2016), which specifies tightening the cap until it “clicks” to seal the evaporative emissions system, and by Toyota diagnostic procedures that list a loose or faulty cap as a common cause of EVAP fault codes (such as P0455/P0456). Toyota’s electronic parts catalog for the bB lists a “Cap Sub‑Assy, Fuel Tank” for these models (commonly referenced part numbers include 77310-52040 and 77310-B1010), confirming the vehicle is designed to run with a dedicated fuel cap.

For owners, the fuel-cap on a 2010 Toyota bB isn’t just a lid — it’s a key part of the emissions and fuel system. It keeps vapours contained, helps the EVAP system do its job, and prevents dirt, water and road grime getting into the filler neck. A good cap seals tight, clicks when seated, and saves headaches like fuel smells, a check engine light, or a failed WOF/rego inspection due to EVAP leaks.

As part of routine servicing, it’s smart to give the cap a once-over. Check the rubber seal for cracks, flattening or hardening, make sure the tether isn’t snapped, and confirm the ratchet “clicks” when tightened. If there’s a persistent fuel odour, a whoosh that seems excessive when opening the cap, or a CEL for EVAP leaks after refuelling, the cap is an easy-first replacement.

Replacement is straightforward: match the cap to the bB’s model code and fuel system spec, then tighten until it clicks 3 or more times. Genuine or high-quality aftermarket caps designed for sealed EVAP systems are recommended. Many techs suggest replacing the cap or seal every 5–7 years in local conditions, or sooner if the seal shows wear.

• Care tips: wipe the sealing surface occasionally, avoid overfilling after the pump clicks off, and don’t leave the cap hanging against painted panels.
• Signs it’s due: cracked or shiny-flat seal, broken tether, fuel smell near the rear quarter, or EVAP fault codes after filling up.

Popular questions about 2010 Toyota bB fuel-caps

Does a loose or missing cap trigger the check engine light?
It often does. The bB’s EVAP system monitors tank pressure. A loose, damaged or missing cap can set leak-related codes like P0455 or P0456 and turn the CEL on. Tightening the cap until it clicks and driving a few trips can clear minor faults, otherwise, inspect or replace the cap.

What cap fits the 2010 bB?
It uses a Toyota-style emissions (sealed) threaded cap. Common Toyota references for the QNC2# bB include Cap Sub‑Assy, Fuel Tank 77310-52040 or 77310-B1010. Always confirm by VIN or model code to match the EVAP spec.

How often should the fuel-cap be replaced?
There’s no strict interval, but checking it at every service is sensible. In Aussie and Kiwi conditions, a cap or seal refresh every 5–7 years is a good rule of thumb, or sooner if there are fuel smells, a non-clicking ratchet, or EVAP-related warnings.