Q:

Is it dangerous to drive without a gas cap?

A:

Quick Answer

Under normal circumstances, driving without a gas cap is not dangerous. Leaving the gas cap off allows gas to evaporate and escape a car's fuel system, which eventually triggers a check-engine light as the leak is detected, but it is usually not harmful to the car.

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Is it dangerous to drive without a gas cap?
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Full Answer

Driving without a gas cap can be indirectly dangerous, however. The failure in the evaporation-control system triggers the check-engine light. While the missing cap is causing this error message, a more serious malfunction could occur that would also trigger a check-engine light, and the driver may not realize it due to the previous warning.

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