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Filler cap
01
the lid on a vehicle's fuel tank used to seal the opening
Example
You can find the location of the filler cap in the owner's manual of your car.
The mechanic checked the filler cap to see if it was causing the fuel leak.
If the filler cap is damaged, it might lead to problems with the fuel system.
Make sure to tighten the filler cap securely after filling up the tank.
I need to open the filler cap on my car to refuel it.
