Cap Filler.
Fuel Tank Cap.

• Seals off your fuel tank and prevents contaminants in your gas supply
• Plays an important role in the EVAP system
• Easy to replace on your own

Your INFINITI's Fuel Tank Cap is a car part that is frequently overlooked. You remove the Fuel Tank Cap, fill your vehicle's fuel tank, and then tighten it back into place with every trip to the pump, but that's probably the only time you think to acknowledge your fuel cap.

The Fuel Tank Cap serves a big part in the efficiency of your INFINITI's fuel system. Obviously, it seals off your fuel tank and keeps outside dirt, water, and other harmful debris from seeping into your fuel. But, it has another purpose, too. The Fuel Tank Cap is an integral part of the EVAP, or evaporative emissions system, within your INFINITI.

When you're driving, your fuel temperature rises, and it generates harmful fumes. But, with a properly working Fuel Tank Cap, your EVAP system can safely contain and recirculate those emissions to stop them from seeping out and contaminating the atmosphere.

If your INFINITI Fuel Tank Cap no longer clicks into its opening, or if it frequently loosens after being tightened, you're likely dealing with an old or damaged cap. Because the cap is part of the EVAP system in your INFINITI, your dashboard engine light may illuminate if your gas cap is loose or broken. Other signs of a worn out Fuel Tank Cap may include smelling gasoline while driving and decreased fuel efficiency with no significant change in your travel behaviors.

There are a couple of drawbacks of a Fuel Tank Cap that's no longer functioning correctly. A Fuel Tank Cap that doesn't seal properly may push harmful emissions into the atmosphere, but it may also cause costly wear and tear in your INFINITI. A worn out Fuel Tank Cap can decrease engine performance, lead to poor gas mileage, and cause fuel leakage. You should consider replacing the Fuel Tank Cap in your INFINITI immediately once you notice that it is no longer functioning correctly.

Replacing an old Fuel Tank Cap is fast and easy, and you can do it yourself. All you need to do is shop genuine INFINITI parts online to get a perfect fit for your model and trim.

This Fuel Tank Cap, part 172519BA0A, will fit the following: INFINITI G25, INFINITI G35, INFINITI G37, INFINITI G37X, or INFINITI Q40. Click on the What This Fits tab for additional information.