if you close this pipe then how fuel tank vapors release from tank??? which is main reason of jerks.. another jugar is to remove pipe which comes from fuel tank into charcoal canister.. and leave it free inside engine bay.. but this is dangerous because of fuel vapors inside bonnet all time... we need to burn these vapors inside intake manifold...so make diy as imran and i said... by this your fuel economy is also increase...
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