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What Causes Evaporative Emission System Leaks?

1 Answers

McHarley

07/29/25 4:38pm

Here are the specific causes of evaporative emission system leaks: 1. Poor sealing: The fuel tank cap gasket is faulty, or the sealing at pipe connections is inadequate, leading to leaks. 2. Poor contact: Poor welding at the carbon canister friction weld or loose seals at the carbon canister engine solenoid valve or carbon canister atmospheric vent solenoid valve. 3. Punctures creating leak points: Pipes, carbon canister, or fuel tank punctured by gravel, causing leaks. Below is additional information about the evaporative emission system: 1. Impact of leaks: If the evaporative emission system has leaks, gasoline can easily evaporate, and fuel vapors will escape from the fuel tank. If these vapors are not controlled, they not only pollute the atmosphere but also waste energy. 2. Malfunction indicator lamp (MIL): China VI vehicles require the OBD system to detect evaporative emission system leaks. If the leak exceeds the equivalent of a 1mm (0.04-inch) diameter hole, the OBD must illuminate the MIL.

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