Cap Filler. Screw.
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

The Fuel Tank Cap on your INFINITI is often neglected. You twist off the Fuel Tank Cap, fill your vehicle's fuel tank, and then tighten it back into place every time you get fuel, but somehow this essential component remains an afterthought.

The Fuel Tank Cap serves a big part in the efficiency of your INFINITI's fuel system. Obviously, it provides a seal for your fuel tank and stops moisture, debris, and dirt from seeping into your gasoline. But did you know? The Fuel Tank Cap is also a component of the evaporative emissions system (aka EVAP) in your INFINITI.

When your engine is running, your fuel heats up significantly and emits toxic vapors. Fortunately, with a properly working Fuel Tank Cap, your INFINITI's EVAP system can safely contain those fumes to prevent them from leaking out into the atmosphere.

If you aren't able to click your Fuel Tank Cap onto your fuel tank, or if it loosens on its own even after you've tightened it completely, you probably have a damaged or worn out gas cap. Because the cap is part of your engine's overall EVAP system, your dashboard engine light may turn on if your gas cap is loose or broken. Other indicators of a worn out Fuel Tank Cap may include smelling gasoline while driving and lower fuel mileage with no significant change in your travel behaviors.

There are a couple of downsides to a Fuel Tank Cap that has cracked or worn down. A Fuel Tank Cap that doesn't fully seal may release harmful emissions into the atmosphere, but it can also lead to a domino effect of other issues within your INFINITI's engine. A failing Fuel Tank Cap can reduce your INFINITI's engine performance, lessen your fuel efficiency, and cause fuel leaks. It's wise to replace your Fuel Tank Cap immediately once you notice that it isn't sealing or tightening properly.

Replacing an old Fuel Tank Cap is simple, and you can do it at home. You just need to shop directly with INFINITI Genuine Parts to enjoy a perfect fit for your model and trim.

This Fuel Tank Cap, part 17251F9912, is compatible with INFINITI G20, INFINITI I30, INFINITI J30, INFINITI M30, INFINITI Q45, or INFINITI QX4. Click on the What This Fits section for further info.