• Prevents moisture and debris from entering and contaminating the system
• Establishes seal and pressure to fuel tank
• Manufactured to strict engineering standards/specifications in materials and tolerances

The color of the cap can be used to identify the vehicle's fuel compatibility. The physical cap is the same, regardless of color.

Gasoline
Black is the standard
Fuel Tank Cap color for
vehicles that take Gasoline

Flex (E85) Fuel
Yellow indicates your
vehicle is Flex (E85)
Fuel compatible

Diesel Fuel
Green serves as a reminder
that your vehicle only
takes Diesel Fuel