- 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 Nissan's Fuel Tank Cap is a car part that is often neglected. You remove the Fuel Tank Cap, fill up your tank, then secure it in place again each time you fuel up, but that's probably the only time you think to acknowledge your fuel cap.
Your Fuel Tank Cap has a big part in the efficiency of your Nissan's fuel system. For starters, it provides a seal for your fuel tank and stops dirt, water, and other harmful debris from getting into your gas supply. But, it has another purpose, too. The Fuel Tank Cap is also a component of your Nissan's evaporative emissions system (or EVAP).
When you're driving, your fuel heats up significantly and emits toxic vapors. But, with a properly working Fuel Tank Cap, the EVAP system can safely contain those fumes to stop them from seeping out and contaminating the air around your vehicle.
If you aren't able to click your Fuel Tank Cap into place, or if it becomes loose after being tightened, you likely have a damaged or worn out gas cap. Since this component is also part of your engine's overall EVAP system, your dashboard engine light may illuminate if your cap is malfunctioning. Other indicators of a damaged or worn Fuel Tank Cap can include strong gasoline odors while you drive and diminished fuel mileage without having changed any of your travel habits.
There are several downsides to a Fuel Tank Cap that has cracked or worn down. A Fuel Tank Cap with a busted seal can release harmful emissions into the atmosphere, but it can also create other significant problems in your Nissan. A failing Fuel Tank Cap can decrease engine performance, lead to poor gas mileage, and create messy fuel leaks. It's wise to replace your Fuel Tank Cap as soon as you realize that it is no longer functioning correctly.
Replacing an old Fuel Tank Cap is fast and easy, and you can do it yourself. Just be sure to shop with Nissan directly to ensure the best possible fit.
The Fuel Tank Cap listed here (part 172519HA0E) will fit your Nissan Altima. Click on the What This Fits tab for more details.
CAP ASSY-FILLER