How can a damaged fuel cap affect the vehicle’s emissions system in Changan Kalam?

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How can a damaged fuel cap affect the vehicle’s emissions system in Changan Kalam?

In Pakistan, emission regulations are becoming stricter. Can a loose cap cause emission test failure?

Zarnish asked on 24 Jun 2025 17:16:46 pm

1 Answer

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Car Mechanic Expert - on 24 Jun 2025 17:20:57 pm

A damaged o r loose fuel cap affects the EVAP evaporative emissions system, causing:

Unburned fuel vapors to escape

Failed emission tests, especially in provinces like Punjab, where vehicle fitness checks are stricter

Increased hydrocarbon emissions, contributing to smog

This can also trigger emission-related DTC codes, making the vehicle non-compliant in regulated zones o r public transport fleets.