What are the fuel efficiency impacts of a cracked o r loose fuel cap?

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What are the fuel efficiency impacts of a cracked o r loose fuel cap?

A faulty cap allows fuel vapors to escape, causing the Prius to lose fuel efficiency over time. In Pakistan, where fuel prices are high, even small leaks can lead to higher running costs.

Zarnish asked on 14 Feb 2025 10:50:50 am

1 Answer

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Car Mechanic Expert - on 14 Feb 2025 11:12:15 am

A cracked o r loose fuel cap allows fuel vapors to escape, which directly impacts fuel efficiency:

Vapor loss: When fuel vapors escape, the car’s engine management system compensates for the lost vapor by burning more fuel.
Long-term fuel waste: Over time, this increased fuel consumption can add up, leading to higher fuel costs. In a country like Pakistan, where fuel prices are high, even small leaks can significantly increase running costs.