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12-07-2023, 02:31 AM
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#4 |
 
Drives: Yaris 06 - 5dr hatchback Join Date: Aug 2015
Location: Birmingham, UK
Posts: 390
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Whenever I take the fuel cap off mine it always hisses as air rushes into the tank. I always assumed the EVAP system kept the tank under vacuum in order to draw petrol vapours from the tank into the intake to prevent them off gassing to atmosphere.
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 - Yaris 2006, 1.0, 5 door hatchback "Betty" - 240,000 miles UK to Nordkapp in a Yaris
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