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Message: <blockquote data-quote="jarance" data-source="post: 222025" data-attributes="member: 21">A proper fitting BMW fuel cap will prevent the leakage of fuel vapors from the fuel filler neck. A leaking or missing gas caps can result in the loss of 40 litres of petrol per year into the atmosphere. In the case of pressure built up, there should be a pressure relief valve to prevent this. Some newer model from 1997 onward have a fuel expansion tank.BTW, the fuel filler cap is similar to the radiator cap. I remember stud daddy have a faulty cap and it cause the fuel vapour to leak thru it. (Nothing related to the problem of this thread)</blockquote>